The collection would need to be written to a USB device which was first formatted to FAT32 using the B2 to do this.
The collection would need to be written to the USB device in a directory format that matches this
Top level
music
Next level
Artist 1
Next level
CD 1
Next
All the music files for that CD and a file of cover art.
CD 2
Next
All the music files for that CD...
etc
Artist 2
CD 1
All the music files for that CD...
etc.
The B2 can then import your music using its USB functions.
Fred