Discovering New Music?

captainclever asks: "As an avid music fan, I'm keen on discovering new artists that I will like. I have discovered a few by listening to internet radio, and writing down the names of songs that take my fancy. I had a play with The Digital Music Network, but it was very intrusive, full of adverts and only worked in Windows. I found it quite a hard topic to google for as there is so much stuff about music. Has anyone come accoss a decent system that can suggest some good artists to me based on my existing listening habbits?" Word of mouth, of course, is the tried and true method of promoting a new group. Are there weblogs that allow users to discuss music much like Slashdot discusses "news"?