We've requested it in the past, but migration paths can only be made with sites that are out of beta. Music Fans is very much still in the beta phase of its life cycle. If it gets out of beta I definitely see this a being one of the first things done, however there are things to consider.
As a mod for both Music Fans and Music we could make a bigger push to do something about this, but I see this being more harmful as of now due to some of the issue I point out here. One of the biggest issues is quality which should be one of the first things assessed before migration. The first rule of migration is don't migrate low quality questions. About half of the flags I get about migration suggestions are for questions that are just a link and a sentence which should not be migrated regardless of if it's on topic or not.
The other big thing is knowing the scope of the other site. We've made other migrations where I talk with mods of the other site before sending it since they have a good feel for the site they moderate. While some users here understand the scope of music fan's, it's better to read around the meta there or ask users of the site if it would fit. I have blocked a few migrations both to and from music fans for this reason.
The last and most important reason is the question has to be off topic here. Being off topic here is the key to migration. If there are other issues with it (too broad, uncelar, ect), it should not be migrated in its current status. Not often, but a few times I've seen questions that were being closed as opinion based or too broad as flagged for migration.
Long story short it will happen someday, but in the mean time you can flag it with the custom reason. Before doing so please consider the following:
- It is off topic here (and not too broad, unclear, or primarily opinion based)
- It is on topic on Music Fan's (if you don't know feel free to ask)
- The current question is of an OK quality