Comment 9 for bug 1220429

Sorry for not replying sooner.
The forum on gmusicbrowser.org is the best place for suggestions, I also prefer getting bug reports on the forum first, and if the bug is not fixed/clarified rapidly you are welcome to report them on github (https://github.com/squentin/gmusicbrowser/issues which I badly need to clean up).
Note that I sometimes take a long time to reply, but I always read everything.

About 'tags e.g. for "key" or "pianist"' you are welcome to send me an example file by email, gmb doesn't yet support custom tags (but it does support custom fields not written in the file), though it is planned. If the tags are relatively standard, I can probably easily add them, probably disabled by default.
If you want to discuss it I suggest creating a thread on the forum, as it's really off topic here.