Assuming that two musicians have the same level of skill, what might increase the job prospects of one musician over another?

Ineed some on finding music. i have a nephew who is into rap, but when i find a rap song, it seems to either be too old for his taste or to him it isn't good enough. can someone suggest some good music for me to see if he likes it or not?

Organum was first developed by religious singers adding another melody directly above the chant and mirroring the chant line. true false

Ineed someone to describe what they mean in the instructions !