I would think that, generally, if the family, or the "guest of honor", at a funeral, requested a song or musical piece for the occasion, the rest of the audience could like it or lump it. I could imagine the possibility of the family having no taste or sense, and requesting something so imappropriate you wouldn't want to touch it. But if the "pre-deceased" reguested it, I would go with it unless I had really serious misgivings. A long-time friend says he would like Hendrix version of the Star Spangled Banner; if I have the opportunity, I'll at least see that it gets played over his grave.