I think you believe, as many others do: -- music has power and spirit all its own. That power can be disruptive socially as well as psychologically and has obvious potential to interfere with the spiritual nature of a group's Aikido practice and the sanctuary nature of the dojo.
My hope is that music might be productively combined with Aikido and that some dojos will continue to explore this relationship since there is great potential benefit-- both physical and spiritual -- in a connection of the two.
What's the potential spiritual benefit? For that matter, what's the potential physical benefit? And how can you avoid having this combination of music and aikido practice becoming at least in part about the music, thus taking away from the aikido practice?