Are ethics not a thing to you?
Do the right thing. Follow copyright. Remember - violations will go down to the VIOLATOR (you) not the school, the band, or the district. YOU will pay the fines if they choose to come after you.
To the OP: You have two options. Secure copyright permission to stream your show (many rights-holders are giving permission for about $20 a song right now) or do a one-day-only broadcast, which is free.