As someone who worked in a music store for several years I've got to say that there's a large percentage of delusional folks out there calling themselves musicians that are more than willing to push everyone around them, not to improve their performance but to promote themselves and reinforce what they're doing.The sad part about most musicians I meet is their inability to be honest with themselves about their limitations. Few get better and even fewer care.
I did an album last year with an artist whom I'd played all year with. My friend was recording the album- it was a freshman experience for him. He needed the experience. The drummer she used was a terrible player; It wasn't a secret that he was bad. I told my friend who was recording that this guy wasn't good enough to record. He ignored me and said he could make him sound good. In the end, the drums were awful; even after retakes of all the songs, they were still terrible. My friend aged a lot through the process and spent 90% of his time doctoring the drums. I can't even listen to the album because it's so bad.
The worst part is that this drummer thinks he's great. That whole experience was very upsetting to me because of how good it could have been with the right players. The songs were good.
I couldn't tell you how many hours were spent with singers who couldn't sing who wanted to go through the whole used mic case to select an awful mic that would somehow give them the character they thought they ought to be promoting. You'd say that the awful mics would not perform in a live or studio environment, and that an SM-57 could be made to sound bad but would at least not feed back horribly or be inaudible and they would continue to go through all the miserable crap mics and buy one only to bring it back saying it fed back the entire time. This was of course in Seattle during the grunge thing in a used instrument store.
On the other hand there are folks out there who may or may not call themselves musicians who are somehow connected to divine inspiration and who make us all need music.
I also walked home to Brooklyn in that 2003 blackout! 
