The easiest way would be to have them all sing to a prerecorded track. Best practice would be for them to be playing it to headphones with the video recorder, whether it's a phone, a video camera or a laptop recording their audio. Maybe have a few clicks on the track before the playing starts that they could clap along to to make synching it up easy. But just using your eyes and ears to synch their performances should be doable. Your timeline's gonna be kind of complicated with 20 video layers (and 21 audio layers including the accompaniment) but should be doable. If that's not possible, I'm sure there are metronome applications available for either phones or computers or I'm betting garage band on the has something that will work. Give everyone the bpm setting and it shouldn't be too difficult to get the performances somewhat in synch if they're working with sheet music... If everyones marching to the beat of a different drummer, you can still make it work by adjusting the tempo of the clips by adjusting the speed in premiere without maintaining the pitch. In my experience, Premiere did not do a high quality job with the audio in this situation but when I sent it to audition to render, everything worked great. You can actually keyframe your speed changes to constantly make sure individual voice are relatively in synch. If you're interested in a actual video where this was done, take a look at this
https://vimeo.com/45157225
I shot multiple rehearsal of the music here during the day and the actual performance with an audience at night and adjusted the playback speed of the rehearsal footage to match the evening performance and audio. Tweaking the playback with keyframes to match synch. Granted it took a great deal of time, but it can be done. also, having all 5 musicians in the edit room critiquing their bowing, etc didn't help.
post back if you have any questions about any of these workflows.
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