Long track names can make a personal catalogue awkward to read, especially on a small screen. Shortening them is tempting, but a private abbreviation may become meaningless six months later. Keep the original wording and your display label in separate places.
Preserve the identifying details
Copy the title from the release you own, including a version label when one is present. Record where the wording came from: the disc, sleeve, booklet, or digital release information. These sources can differ, so a small source note is useful.
Create a shorter label only for your own browsing. If you remove a subtitle or movement name, make sure the full form remains available. Do not silently replace an uncertain word with a guess.
Test the label away from its context
Look at the abbreviation without the album cover beside it. Can you still tell which track it refers to? A label that works within one album may be ambiguous in a playlist containing several releases.
Try the method on a handful of entries before changing a whole collection. The aim is to make finding music easier while preserving the information that lets you check your choices. A catalogue should support listening, not gradually erase the distinctions between recordings you wanted to keep.