I am working on a song and I am trying to write a solo. I can't seem to good it though. I can't figure out what key the song is in either. the chords for the verse are (power chords) D flat, G flat, G. and the chorus chords are (Power chords again) E minor, B, C, G. What is the key and how do I write a solo for it!!
It depends on alot of other factors, tempo, general feel etc. Id say listen to bands similar to the sound your trying to achive and find out what scales they use.
Check out the key signature, also, write out the notes of the chords and figure out scale would best match those notes, if theres a few notes that don't fit that scale will still work
Also, generally the last chord of a song is what key it is in....usually