You can go to different websites online like Yamaha or Buffet.
You could probably find it online, on the internet.
You can find it on Music.com search flute music then type in the song
In A Music Store.
Just about any ensemble can use a flute if the music is written in it's range (a piano 4C to upwards of a piano 8C) Most often you will find flutes in symphonies, woodwind ensembles (quartets, quintets, duets, etc), some orchestras, not uncommonly in jazz bands, and a lot of folk music to name a few
8notes.com
I don't think there is one. I've been wanting to do that piece as a flute choir but i could never find it. I've been looking for about a year...
I play the flute, and I just play things from piano music. Try it! You could just google piano music for any song (if there's piano). Sorry, that's all i can think of.
I'm not sure where you could find flute shhet music for arms of the angels. But if you find music you can translate it into any key. It will be particularly easy if it is already in the key of B-flat because that is the most basic key on flute. If that doesnt help go to your nearest music store and put in a request. If it is not on the internet that will be your best bet.
internet
There are many places to find the All-Star flute music. The local music store will most likely have this music.
Flute tunes .com