I learned about secondary dominants recently, and I found that this particular progression in the key of C major sounds quite nice:
C - E7 - Am
I - V/vi - vi
I am playing it in the following voicings:
C E7 Am E|--8---7--5-- B|--8---9--5-- G|--9---7--5-- D|--10--9--7-- A|--10--7--7-- E|--8------5--
With the following strumming pattern:
C |E7| Am D-DUDU-DD-D--DUDD-D-D C: D-DUDU E7: DD Am: D--DUDD-D-D
After I run through this progression one time, I want to play a little filler lick before repeating to spice things up, but I can't quite figure one out. I have tried playing around with the C major/A minor pentatonic scales but nothing really sticks out. How can I know which scales to target for nice licks within a chord progression? Is it not as cut and dry as an entire "scale" but rather look for certain notes to embellish the chords with? If this is so, from which chords do I take notes from to embellish? On Youtube or Instagram, most lessons I see just use major pentatonic or the relative minor pentatonic of the tonic. Am I just not looking hard enough in Cmaj/Am penatonic for a good lick? An example lick would be awesome.
When I play through the progression the second time, my ears want to repeat with variation very badly. By this, I mean that I want to play something other than an Am the second time around. I conceptualize it as a higher pitched chord, so something further down the neck than Am. I tried just different voicings of Am but that didn't quite capture what my brain is feeling. I tried Fmaj7 in the 8th fret barre shape, that kind of got there, but not quite what I wanted. What are other chords E7 resolves to nicely in the context of C major?
Please forgive any blunders I may have made regarding terminology. I am still learning all of this music stuff :) thanks!