I'm going to be the first to answer, but I'm going to give it a big "depends."
There have been several studies that show certain types of music (e.g., Classical, Spiritual, upbeat, etc.) have a positive effect on mood while others (e.g., Death Metal, Doom, etc.) can have a negative effect. Naturally, some of these studies were done using plants (which obviously didn't grow up with Rock and Roll), so your mileage may vary.
Personally, I like a LOT of genres and I'm generally an upbeat guy because of them, but too much Country and most Rap (or anyone puking into the microphone) makes me want to start a killing spree.