mixing two major scales

ok, I know that you aren't supposed to mix any two major scales, but I recently wrote a solo that mixes A Major and D Major. To me it sounds absolutely amazing, but I was wondering if anyone on here has played around with this kind of stuff.

Are you talking about Dmajor over top of and at the same time of Amajor? If so that's just parallel thirds, parallel harmonies... it was common practice in Gregorian chant and has been used for a long time. But otherwise unless you do a key change underneath your solo I'd replace Dmajor scale with DLydian mode, since it is diatonic to Amajor and actually shares the same notes. But you can ignore any rule of theory honestly if it sounds good to you!

yeah, it sounds just like the end of the solo in "Beat It" when Eddie does the trem pick walk up. To me it sounds insanely cool, thanks for letting me know what it was :)

no problem!

It's not that you're not allowed, it's that you're supposed to know what you're doing, and you do. Besides, you could just do key changes, and I do that all the time. If you like what you're doing, keep it up.