Seems to me all of the above is a good example of why one should keep a local copy of your data, and NOT use proprietary and/or 'cloud' software that locks you in/out of access to said data.
Keeping your music in say mp3 format on HDD or USB drive (preferably two or three so you have backups) will ensure you have it to hand when needed, when the interweb doesn't work, and in a format that pretty much anything will play. Even if you wish to continue with the proprietary/'cloud' lock-in I'd strongly suggest regularly exporting your data to a local backup using standard formats, if the system will allow (and if it didn't allow I'd be all the more leery of using it!).
FP.