Happened to be watching an old episode of the BBC programme Top Gear last night and as it is is shown in over 200 countries I presume you will be aware of it.
Anyway they had Slash on in a “reasonable priced car” but I thought you might be interested how the show ended.
It starts off with a Amajor arpeggio into the A major scale. Then switches to A Dorian and A Mixolydian and finishes off in D major Pentatonic. But you don’t need to know any of this to play it.
If you just want to jam to the backing track you can get away with the A major and A pentatonic scales.