Queen shunned coherent rock to make plenty for a song (2,3,5)
I believe the answer is:
on the cheap
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for on the cheap that I've seen before include "At a low cost" , "By cutting a corner (on expense)" , "with minimal cost" , "(Done) inexpensively" , "at minimal expense" .)