I've been with ServerAxis since November 2006 and they have been rock solid. Currently, for my very small hosting needs, I'm paying $9/mo for 512 MB RAM and a 16 GB SSD HD with 500 GB/month bandwidth. Full root access is included, but you have to install the OS off of one of their base images, with the options being CentOS, Debian, Gentoo and Ubuntu.

If your music is in a good directory/filename structure you can use MP3 Tag Tools to automatically read the filenames/directories and write the tags based on that. It will also take your tagged music and put it into the right folders with consistent filename. I have found it to be extremely useful for organizing my music files.

The software is Windows only, but EasyTag on Linux can do very simaler things. I'm not sure of a Mac equivalent.