There are two major keys for a musician to have good ears for music.
(1) Listen to the roots of modern music, including the roots of your own influences and their roots back into the chain of time. Those who are unaware of their roots tend to lack depth in their own music.
(2) Keep listening to new music of all genres as pop music keeps moving forward. Those who don’t stay current will have the dreaded “over the hill ears” and will no longer make music that is relevant.
The music randomizer on this website is specifically designed to help musicians keep their musician ears.
The music covers all of the major pop genres of the last century and is regularly updated to include all of the current major hits from all of the major pop genres.