alright so i'm gonna tackle achtung's request first since it's the oldest. first off i'm no expert and i've never learned theory. there are more than a few people here who can offer better explanations why certain scales work with certain chords than me (seerix and roivas particularily).
as for playing tips in regards to psychedelic blues lead, well, here goes nothing hehe.
eric clapton is a great example of generic electric blues playing. i'm not saying he's bad but he does (or did) live in that blues scale geryon posted.
here's the numberically tabbed version of the same scale as if you would play it from lowest to highest note. if you don't know how to read tab already it's pretty simple. each line represents a string and the numbers are the frets.
/ - means a slide
b - is a bend, usually a full step (2 frets) unless otherwise indicated.
~ - is vibrato
h - hammer on
p - pull off
there are more symbols but that's pretty much all you'll see in blues based stuff. (if it's even marked into the tab)
e |------------------------------------------------------------------------------------------9--12---
B |-------------------------------------5--------------------------------------------9--12----------
G |------------------------------4--6------------------------------------9--11-12------------------
D |-----------------2 /-4-5-6------------------------------------9--11-----------------------------
A |----------2--4--------------------------------------9-10-11-------------------------------------
E |--2-3-4----------------------------------------12------------------------------------------------
i think that's the pentatonic scale in E. the solo for 'i feel free' starts in A so you end up playing the same pattern 5 frets higher up on your guitar. it's basically all about the relative spacing between the notes and not the actual notes themselves. or something
i haven't heard cream's 'i feel free' in years and i'm not having luck with soulseek or any attempt to find my cream's greatest hits cd... so i'm going to be using the tabs for 'i fee free' from.
http://www.ultimate-guitar.com/tabs/...l_free_tab.htm http://www.ultimate-guitar.com/tabs/...e_ver2_tab.htm
i'm also going to copy some of it without permission.
The lead solo part : ///hard to hear
e---------------------------------------------------------------|
b----------------------------------15b-12-----------------------------------|
g--14b~~~~~~-14p12-------------------14~~~---12b~~~-12-10-12b~~~~~-----|
d---------------------------14-------------------------------------------|
a---------------------------------------------------------------|
e---------------------------------------------------------------|
later ...
e--------------15-17b~~~p15-----------------------------------------|
b--15b~-17----------------------17---15---------------------------------|
g-------------------------------------------14b~~~--14-12-10-12-14b~~~~----|
d---------------------------------------------------------------|
a---------------------------------------------------------------|
e---------------------------------------------------------------|
e|----------------------------------|----------15-------17--15--------15---------15----15---|
B|-15------------------------------|--15-17-------17----------15-17---17----17---17------|
G|----14----14--12-10-12-14b--|------------------------------------------------|
D|---------------------------------|------------------------------------------------|
A|---------------------------------|------------------------------------------------|
E|----------------------------------|------------------------------------------------|
e|--17--15---------------|
B|-----------17-15-etc.--|
G|-------------------------|
D|-------------------------|
A|-------------------------|
E|-------------------------|
so the first 2 bars are from the first tab the last two are from the other. since i haven't heard the song in a long time i'm going to make an assumption and guess that the 2nd tab author was lazy and didn't add the h and ps in the 2nd part
anyway to breakdown how you'd go about playing something like this there are 3 main techniques you need to get used to bending, string skipping, hammer ons and pull offs.
bending a note is one of the simplest things to learn but one of the toughest to master ESPECIALLY when playing electric blues. bending the string is simple you just fret the string at the indicated note and bend upwards until the pitch is the same as it would be 2 frets higher on the neck. more often than not i bend my notes with my ring or little finger that way i can use my middle and index fingers for extra support on the bend (they raise the string while the ring finger holds the note). another technique to practice bending is unison bends, where you play the target note 2 or 3 fret lower on the neck on the next highest string. (the end of hendrix's solo on 'all along the watchtower' is a great example of unison bends right before he goes into that crazy high bend for the end of the tune)
e|-------------9----------|
B|--10--------12b-------|
G|--12b------------------|
D|------------------------|
A|-------------------------|
E|-------------------------|
the next thing you need to learn with bending is
vibrato basically it means shaking the note. i don't remember exactly how clapton said it in an interview but he compared adding vibrato to a guitar note with the way opera singers added it to their voices. they let the note ring out first then gradually bring in resonance and vibrato. there isn't a specific right way to add vibrato to a note, some people like bending the string up and down, others go front and back, personally i use the B.B. King method of shaking my wrist. the vibrato is what will keep your note ringing for longer and how most people add some element of emotion into their playing. you can never practice it enough.
for me
string skipping (like the 2nd part with all the 15s and 17s) basically just involves using your index finger as a mini capo and relying on your other fingers to handle the rest of the lick. simple way to make it sound a lot fuller are
hammer ons and pull offs, which is really just playing more than one note from a single pick attack.
e|----------------15h17--18p17p15----|
B|--15h17p15---------------------------|
G|----------------------------------------|
D|----------------------------------------|
A|----------------------------------------|
E|----------------------------------------|
with this example you'd be keeping your index locked at the 15th fret on both the B and e strings. for the first part pick once to sound D (15) note then tap the E (17) with your ring finger then pull it clearly off the string and you should hear all 3 notes clearly. with the 2nd lick you still start on the same fret but you hit the string twice with your pick. the first time you pick it you would sound the G (15) then hit the A(17) but this time you'd leave your finger in place then quickly fret the Bb(18) with your next finger before cleanly pulling off those two notes to finish with a clear sound on the G (15).
the most important thing to remember when practicing hammers and pulls is a clean transition. you really want your fingertip to come down hard and direct onto the string, as much at a perpendicular angle as possible.
i hope these beginner tips proved relevant, practicing those 3 techniques pretty much covers the very basic of blues lead guitar. i can't stress
vibrato enough though, it's one of the techniques that REALLY adds to your style and sound when playing guitar.
2 last tidbits before i finish this up.
it's as much about
how you play it as it is about
what you play.
the most important thing to remember when playing music is to have fun.