#1
What pentatonic scale to use?

I was playing over it a couple of hours ago and it sounded awesome but I just can't find out what key I was using.
#2
I think Am?

Am blue penta
Am Aeolian
Am Phrygian
Am Dorian

try those
#7
Am for the Am and C, A Harmonic Minor for the E and E7.
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#8
Quote by DaddyTwoFoot
Am for the Am and C, A Harmonic Minor for the E and E7.


So like switch scale in the progression, rights?
#9
I don't know the song or the sound you want, but:

Quote by DaddyTwoFoot
Am for the Am and C, A Harmonic Minor for the E and E7.
I concur.

Quote by Nilpferdkoenig
So like switch scale in the progression, rights?
Yup.

The E chords have a major 3rd (G#) which isn't in A minor. G# is the natural 7 (leading tone) of A which is in Harmonic Minor so it makes sense to switch to that during those chords. You could do Melodic Minor as well because it has F# and G# in it and the F# isn't in the way of the notes in the E chords (E, G#, B and E, G#, B, D).
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#10
Don't think of it as a full scale change, just think of it as the same scale with a raised seventh. Mentally and visually it's going to be much less of an effort. This said, both methods are 100% valid.