Santana - El Farol

It's basically a cycle of 4ths in the key of A minor. Only real difference is the E7 instead of Em, or dominant 7th to offer resolution on Am.

So:

Verse
Am - Dm - G7 - Cmaj7
Fmaj7 - Bmin7b5 - E7 - Am

Chorus:
Am - E7
Really classic stuff, same chords that multiple songs and classics.

For improvisation, I would suggest obviously A minor, then play around with the melody and the chord changes. There are multiple way to play around it, obviously A minor is relative to C Major, so play around with that and all its modes D Dorian, G Mixo, C Ion, F Lyd etc.
Getting back to Am the minor harmonic scale works great.
That means sharp the G to a G# (or min7 to maj7 in the scale), G# being the major third of E it will work beautifully with the E7, so try it out for the Chorus specifically.