This is a private tracker mainly for music releases, but that's not all! They have an amazing selection of E-Learning, software and comics as well.

It has to be the best looking trackers I have ever used. It makes me want to login everyday and just stare at the screen lol

"Founded in October of 2007, What.CD is a private BitTorrent tracker focusing largely on music. With its fast download speeds, well-seeded torrents, and wide selection of music files encoded in such lossless formats as FLAC, in addition to such lossy formats as MP3, Ogg Vorbis, AAC, and AC3, What.CD is a music-lover's paradise. For the true audiophile, What.CD offers FLAC 24-bit/96 kHz vinyl, SACD, DVD-Audio, and multi-channel DTS rips. Furthermore, What.CD offers eLearning videos, eBooks, comic books, software, and audio books." Taken from: What.CD Interview Preparation

Tracker Stat:
Tracker: What.cd
Tracker URL: http://what.cd/
Sign-up: Invite only
Invites: You can go to their irc chat room and take an interview to become a member
Category: Music
Categories: Music, Applications, E-Books, Audiobooks, E-Learning Videos, Comedy, Comics
Maximum users: 200,000
Enabled users: 164,298 Details
Torrents: 1,675,298
Releases: 696,984
Artists: 587,002
"Perfect" FLACs: 455,634
Requests: 228,976 (72.94% filled)
Peers: 11,769,323
Seeders: 11,608,621
Leechers: 160,702
Seeder/leecher ratio: 72.23

Tracker's IRC irc.what-network.net (+6697 #what.cd, #what.cd-help, #what.cd-disabled, #what.cd-invites)

Screens

Banner/News:

Browse page

Requests Page

Collages page

Forums

Rules Page

Top 10 Page

Ratio Requirements

User classes

Collages (example)

My ratings:
Content: 10/10 (you can find there many releases. may be not all but i found)
Speed: 8,5/10 (Many users use seedboxes and seed many torrents)
Community: 8,5/10 (as for me good forum, better than others, but i know better)