KeyFinder

KeyFinder is an open source key detection tool, for DJs interested in harmonic and tonal mixing. Designed primarily for electronic and dance music, it is highly configurable and can be applied to many genres. It supports a huge range of codecs thanks to LibAV, and writes to metadata tags using TagLib.

It's intended to be very focused: no library management, no track suggestions, no media player. Just a fast, efficient workflow tool.

The accuracy of the algorithm is pretty good. Here's a comparison with some other packages. A hundred tracks is not enough to draw any significant conclusions, and I don't claim that KeyFinder is better than other software, but I think it shows that the algorithm is in the same league.

The standard KeyFinder interface performs batch jobs, detecting the keys of a group of files quickly and simply. There is also a detailed analysis interface, which can be used to visualise chord structures, melodies and key changes in a single recording.

http://www.ibrahimshaath.co.uk/keyfinder/

MusicBee musicplayer

If you are looking for an application geared toward managing extensive music collections, easy to use and with a comprehensive feature set - MusicBee is that application.

MusicBee makes it easy to organize, find and play music files on your computer, on portable devices and on the web.

http://getmusicbee.com/

Trace Reddell - sound and imagination

Trace Reddell is a writer, artist and theorist exploring the interactions of sound and the cosmological imagination. Trace's live cinema performances and video works have screened at over thirty international venues including galleries and new media festivals

DIGITAL SOUND CULTURES explores some of the cultures of artists, producers, distributers, and listeners that have formed around digital audio technologies and their most important analog ancestors. The class combines reading of critical texts with the study of several audio genres, including post-WWII electronic music, science fiction film scores, space age lounge and exotica, cosmic music, Krautrock, psychedelia, heavy metal, punk, post-punk, afrofuturism, dub, hip-hop, free jazz, improvisation and jam, new age, ambient, techno, trance, drum’n’bass, and microsound. This class encourages us to listen to these sonic forms as intersections of technological, ideological, and imaginative forces.

http://mysite.du.edu/~treddell/courses-3570-2011.htm