I'd say good options to tame using music box is Draptor, specially now that alot of people want to kill it for bestiary. Another monster you can use a music box is Dragonling since the Decorative Ribbon is hard to find at some servers.
You can use the music box to mount: Dragonling, Draptor, Ironblight, Enraged White Deer, Magma Crawler, Midnight Panther, Panda, Wailing Widow ou Wild Horse.
My top 3 of "rare mounts" are:
To be honest I never try use it in another mounts, but this is what I found on Wiki.
I would say that the rarest mount after Midnight Panther that you can tame with Music Box will be:
You can tame those monsters with Music Box: Dragonling, Draptor, Enraged White Deer, Ironblight, Magma Crawler, Midnight Panther, Wailing Widow, Wild Horse, Panda.
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