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What exactly do you mean by band music? o.o
(All questions audition/wise are supposed to remain in the main forum. Just a little fyi. I will edit it that in a second after I answer your question.)
Anything made by a band that doesn't show off your range... um ( not sure if that makes enough sense)
'Band music'--Is not something a person would sing at a school-district judge rated competition where there are instrumentalists, choirs, ensembles, duets etc Maybe a glee club, or a show choir? But a place where its formal, aria, classical, baroque, or even a broadway song. One exception I'll have, is if there is a band song that was arranged in a way that doesn't have all of the added effects, and synthetic sounds where a person needs to be amplified--like lets say, the ' american idiot' musical, or ... something from queen? or journey?
I've been around gaia forums, and throughout what I've seen with 'singing talent' auditions...people used band music, and when I listened to them out of my own curiosity, it just did not come out right, and I didn't know the song. So it sounded odd without music, and their pitch went down hill . I enjoyed that they picked it because it meant alot to them, and its sentimental, but when you want to audition for something--to me, it is just not appropriate for that, specifically. I've seen people audition at real musicals with pop songs ( I think it was a little boy, and he sang a song from confession of a teenage drama queen xD) I couldn't believe it, and he went off pitch almost immediately. I was glad to know the song, but I don't think the director necessarily knew it.
So yeah.
Band music-- unless there is an ongoing melody(to keep from losing pitch and going flat), its popular(most people heard it), and can be done acapella
I don't know how to take it, but just to ask them to sing something else. Like 'Twinkle, twinkle' or 'happy birthday'
And i know, there are some really kick-a** band songs I would have wanted to audition with back in the day. But thinking about it, it wouldn't make sense to use it, because it was cool because of the added effects and bad a** guitar riffs. It would sound weird without guitars, and drums... and I remember trying to sing something like that acapella once, it was just awkward...