"Solo music artist" can be interpreted any way you like. It was basically just meant to be a second "favorite musical artist ever" type category along with favorite group. I chose Robert Wyatt, who writes and performs a lot of his own material but also has other musicians play on his albums, even though he hasn't been in a real band since Matching Mole.
I don't care enough about them to have a favorite."
Oh brother. Okay, try this- imagine that the vocals from every album you own are suddenly missing. Which do you miss the most?
"nobody can even agree on what a songwriter is so I can't nominate a favorite."
Wait, what? Was there an epic Babble thread where we all argued over the definition of the term "songwriter" that I'm not remembering? I didn't realize the term was so open to interpretation.