[itsme]

In my understanding a song in a new key is a new arrangement and belongs to a copy of the song (the song, not necessarily the file).
The new key belongs to a band / line-up, for which I use collections. I use setlists specifically for a gig. For the repertoire of a band I use a collection. With the same band we usually play a song in the same key, at many gigs matching many setlists. So why should I store the key many times with the setlists?
It fits perfectly for my needs how MSP implements that, no workaround at all.