I'm working on a NSMB2 mod. Currently I'm trying to include custom music, but without replacing existing music (since I'm keeping all existing level themes while adding a few new ones). However, I have pretty much no idea how to do that. I saw mentions of a "BBID list", and while I saw some .bbid files in the RomFS, I think the BBID list is something different. I couldn't find any information on editing either of both, though. So, if I have the file STRM_BGM_KORICHIKA.bcstm and want it to be the last entry in the level music selection (I saw CoinKiller's musicids.txt references some sort of numeric IDs), what exact modifications do I have to apply to which exact files?

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