A low-tech option is to keep at hand a copy of Morgenstern and Barlow’s Dictionary of Musical Themes.[0] Listen for a central theme in the piece that’s playing, search for the sequence of notes assuming that it’s in the key of C major or minor, and voilà.
There used to be a website that offered a search function for this work, but it went offline some time ago.[1] I really miss it (though I own a printed copy).
There used to be a website that offered a search function for this work, but it went offline some time ago.[1] I really miss it (though I own a printed copy).
[0]: https://en.m.wikipedia.org/wiki/A_Dictionary_of_Musical_Them...
[1]: https://web.archive.org/web/20160310085832/http://www.multim...