HEATKEYS

Tests your audio equipment, speakers, room acoustics and hearing. Audio signals and test tones playable online. High resolution sound test files available for free download.

Learn all about Singing from this free online guide with lessons on Vocal Exercises, Pitching Tips, Musical Scales and much more!

Internet Archive is a non-profit digital library offering free universal access to books, movies & music, as well as 150 billion archived web pages.

Ableton Live is about making music: for composition, songwriting, recording, production, beatmaking, remixing and live performance. For Mac OS and Windows.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Music, movies, TV, shows and now friends. Get connected on iTunes 10.

Shutterstock Footage offers a growing library of royalty free stock footage, stock clips, and stock video for use in film, television, commercials, interactive web sites, and other multimedia productions.

Indiana University Bloomington is one of the leading public research universities in the United States and the flagship campus of Indiana University’s eight campuses statewide.

Tuts+ teaches creative and technical skills across many topics to millions of people worldwide. We offer tutorials, articles, news and insights that help you take your knowledge to the next level.

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education