As a side note, there’s a multiplatform Qt6 clone of foobar2000, called ‘fooyin’: https://github.com/fooyin/fooyin.git I’ve never been a foobar2000 user, but I’m really impressed by this program; especially the customizability of the UI with respect to custom tags.
Qt based file managers (PCManFM, Dolphin) usually have a filter input that’s quite useful. It’s limited to the current folder, and not a fuzzy finder, though.