I'm just getting into playing solos over some chord progressions, and I've run into a wall. Most of the stuff I've learned on my own is luck- but there's this song that goes G, D, Em, C. Since it's in the key of G, I thought I could play the G major scale. Well, it sounded like crap. But when I played Em, any note I hit sounded good. Why? Is there anyway to find scales that are composed of notes that are 'safe' to play in any key? I'm aware that the major scale is one continous pattern and the natural minor is extracted from the major, but where do you start when playing? Is there any completely 'safe' scale, or do you have to change when the chords change? I've only been playing for a year, and all the guitarists I know play by ear, so they're clueless. Could someone give me a start?
Thanks.