Hello Sunra956,
Thank you for using Apple Support Communities. Sounds like you're experiencing issues with a specific music track. When trying to transfer it to, it cuts down to 10 seconds. If so, we'd like to help out and see if we can get this issue sorted out. Try converting the song to a different file format, follow the steps listed here:
Convert a song to a different file format with the Apple Music app or iTunes for Windows - Apple Support
On your Mac
1. Open the Apple Music app.
2. In the menu bar, choose Music > Preferences.
3. Click the Files tab, then click Import Settings.
4. Click the menu next to Import Using, then choose the encoding format that you want to convert the song to.
5. Click OK.
6. Select the songs in your library that you want to convert.
7. Choose File > Convert, then Create [format] Version.
New song files appear in your library next to the original files.
Additionally, you'll want to make sure your macOS if fully updated. New updates include various fixes. Just in case, this resource can guide you through the update process: Update macOS on Mac - Apple Support
We hope this helps out. Thank you for using Apple Support Communities. Take care.