I'd better make an announcement here as well. If you ever run into problems with a song that loads forever or is corrupt, or if all your songs are gone one day, contact me. It's not impossible that I can actually fix the problem and recover the song full, or at least to a useful state. Remember this announcement until you need it.
Contact me at nitro2k01@gmail.com or with a PM.
To try to recover a song, I need a sav file from your cartridge. If you back up the data at several points, don't overwrite any old files, as an old file may contain data that was later corrupted.
Don't simply send me a "lsdsng" format file as that may not give me all the data I need. Don't play around with the file in LSDManager without saving a copy, as that may also overwrite useful data.
And of course, prevent the disaster before it happens by backing up often and store your backups in a safe place. 