I'm sure you'll agree with me that Iron Maiden are a cult band that composed and performed immortal songs, but maybe you don't like all of their periods. Let's say you would like to exclude the albums from the Bayley's period. How could your do it?
Provided that you tagged those songs with a "bayley" tag, you can use the -/ operator to exclude those songs from the results:
$ ls ~/myfiles/store/iron_maiden/-/bayley/@/
Think to the -/ operator like a filter. First all the songs tagged iron_maiden/ are selected and then all the songs tagged bayley/ are discarded from that selection.
The -/ operator applies only to the tag that follows it, so if you want to exclude another singer, you can do it with:
$ ls ~/myfiles/store/iron_maiden/-/bayley/-/dianno/@/
But pay attention: you have one more singer left. I've warned you.