What are the best sites for uploading

your own music to?

Do they cost? If so how much?
What are the pros and cons if any.

many thanks

dmusic.com
I've also used this one for free.
Some of the pros of these sites is they generally have a lil community of their own with forums, feedback comments, ratings, and charts.
The biggest con is they generally don't allow direct linking from other pages to automatically open particular songs. But you can still link to your particular artist page.

I use mp3unsigned No problems at all, easy to use, I prefer the presentation aswell if you are showing someone your work. Its free for the first 3 tracks and costs next to nothing after that. The sound quality is good and there is a volume fader on the player. Also, the music starts immediately, there are no problems with buffering. I prefer it over soundclick because of the look of the band pages and to my ear the sound quality is not comprimised. Check it out, I give it a thumbs up.