They will take an SPL-Meter and measure the sound pressure level. The closer you are to the band, the louder is the level. The level decreases with distance after the 1/r law. Each distance doubling will give 6 dB less level.
audiological evaluation
iTunes defines Flyleaf as "rock." Personally, I would consider them a hard rock band.
They could be in any type of band. Train includes an ukulele in their instruments (Hey, Soul Sister).
Same kind of people who would name a band the Dead Kennedys or Butthole Surfers. Need I say more?
Chemical beam
a music band.
It depends. If you are in an orchestra, it would be the Timpani. If you are in a Marching Band, I would say either Snare or Bass drum. It all depends on what kind of band you are playing in.
A rock and alternative band
They are a rock band.
You would use some kind of balance to measure mass.
the answer to that is unknown to man kind
a rubber band! lol!