This one doesnt include without music and classic rock (because of time restraints)..
Im going to Wildwood for a few days tomorrow, so (only if this trial gives me some counterexample data), I wont be able to do the labs until at least tuesday.
But from what I've seen so far... we can almost consider this myth busted...
After my first trial failed, I decided to seek out chloramphenicol to replace the nutrient agar (and hopefully render some growth). My biology teacher said the school could not provide the material, so I am using chocolate agar plates (heated sheep's blood) to grow the bacteria as well as soft-serum agar (so 2x the results per trial!)
The lab is set up the same as last time, with one or a couple more control groups: and here are the results:
Each colony formed was small and white or beige colored. Besides one colony which was removed as a fluke, all were round and smooth-surfaced. Here is the ~ amount of colonies per petri dish after incubating for 18 hours.
Before listening: 24
After 1/2 hour (just headphones): 27
After 1/2 hour (classic rock): 22
After 1/2 hour (punk rock): <12
After 1/2 hour (electronica): 24
After 1/2 hout (contemporary classical): 21
After 1/2 hour (classical/ethnic/folk): 37
The average amount of bacterial colonies from before headphones was: 24
The average amount of bacterial colonies in the listening sessions was: 23.2
The average amount of bacterial colonies in the just headphones session was: 27
This strongly indicates that there is little/no effect on bacterial growth listening to music with earbuds. Although some sessions ended strangely (namely punk rock and classical/ethnic), the average amount of colonies was just .8 away from without headphones.
In trial #3 and #4, I plan on spending as much time as I can to get the most exact results (this requires a lot of time...not so much the dedication )
Thank you very much for everyone's help, and I'll be updating in a couple days,