Since my band can't seem to find a decent singer I am going to give vocals a shot for our album , at least vocal demos for someone else to go over down the road. But if it sounds good I will just keep mine in there. Anyway here's the deal: I'm a pretty decent singer , clean and screaming vox. But I am mainly a guitarist. I know almost all the guitar scales and I have a firm grasp of harmony. However when messing around with some vocals and tuning them manually in Auto-Tune to make sure I was on pitch, I realized that vocal scales are almost all different than guitar scales. The only scale I recognized was Major. So as a guitarist , can someone explain how I should make sure what I am singing matches with the key and scale of the music? For instance if a section is in C Pentatonic Blues Scale , how do I know what vocal scale to sing over with? Any help would be really appreciated with this , as the internet is not helping me right now.