tool is the most amazing band out there right now and are probably the only mainstream band worth your time. absolutely amazing stuff, i would label it as progressive hard rock or something in that vein. they kinda remind me of a heavier pink floyd, and obviously sound alot more modern. they play alot of weird time signatures, their drummer has to be my fav. of all time, maynard is the most incredible rock/metal vocalist i have ever heard(listen to a perfect circle), the bass stands out and plays its own thing most of the time and is often the lead instrument, and the guitarist has a knack for coming up with the most memorable riffs and sounds. anybody out there who is convinced they suck because they are mainstream should definitely check them out trust me they are worth it. they are no nu metal band that is for sure. somewhat similar to opeth(not sound wise) in that they create strange moods in songs and like to go between softer and harder moments, not to mention both these bands are progressive as fuck and dont stick to a verse chorus formula. my personal favorite song is eulogy (look at my sig.) if someone is looking to download a song.