What release group type would you use for this situation? A collection (~45 minutes) of unnamed studio outtakes / sessions. The release surfaced/spread by ripping the original tapes (recorded in the 70s) and shared on online forums. Obviously a bootleg, but would you say type ‘Album’ or ‘Other’?
It seems to me common and named collections in this fashion typically receive ‘Album’ type, but uncommon/unnamed collections often are marked ‘Other’. Because this wasn’t really “released” I’d argue the distinction shouldn’t really be between Album/Other.