E major sacles low E 2-4 A 2-4
for example Crazy Trian riff listen to ithttps://www.youtube.com/watch?v=hQ_Z-10dXSE
lots of riffs are based on scale especially the Randi Rhodes riffs
watch Marty Schwartz 5 top ways to play solos https://www.youtube.com/watch?v=YO8J7rF3bHE&t=4s so i learn to practice the scales