Hi, I tried finding the E minor pentatonic scale on my guitar using the theory of whole and half steps. I think it sounded awful and maybe there's something I'm doing wrong.
pentatonic scale = 32232

3+2+2+3+2=12, and the modern western music system is a 12 tone system.

major scale = 2212221

2+2+1+2+2+2+1 = 12, 12 tone music system

hope this helps