+1 quiet bikes
My favorite bike to ride is my fixed gear Wabi. It basically makes no sound at all, none. Squirt lubes my chain on that bike. It makes sneaking up on other riders a fun and entertaining thing to do.
Back in the day we would hunt-down freewheels that were really quiet, and, pay more for those. Regina's were especially quiet. Steel bikes with the right equipment and drive train are still really quiet. Carbon fiber bikes sound like a guitar playing bike sounds. I could never ride one because of that.
Yeah, I guess I'm weird in that respect, but I don't care. Quiet is the way to go for me.