"I wanted to find the source of the music that inspired me when I first started out, " he says.

NPR: Ray Davies: Rock Legend Rocks On

This opens the world's largest and most trusted source of music metadata and music recognition technology to developers who are building the future of music.

ENGADGET: Gracenote unleashes its vast musical know-how to developers

At the very least, Brown was the crucial source of the rhythmic method that now pervades popular music worldwide.

NPR: A Tribute to James Brown

"Rock Band" is one of the bigger titles in the music videogame genre, which has been a significant source of revenues for the gaming industry in recent years.

FORBES: Personal Tech

Spotify is now the second single largest source of digital music revenue for labels in Europe (IFPI, April 2011), making sure that artists get a fair deal.

ENGADGET: It's here! Spotify lands in the US (video)

The app features a simple drag and drop interface making it easy to connect any music source to the speaker of your choice.

ENGADGET: Philips showcases its 2013 Fidelio audio lineup at CES, we go eyes-on

Regardless of the beat's source, music historian Peter Guralnick says that Diddley made it big enough for everyone.

NPR: Bo Diddley, Architect of Rock, Dies

The Doors' fame has hardly faded even though they're one of the few groups not to allow their music to be used for commercials, a source of great tension among surviving members.

NPR: Manzarek, Founding Member Of The Doors, Dies At 74

In 1972, he played a small benefit for George McGovern, at a movie theatre in Red Bank, but, as a young man, his interest in the music was almost completely as a source of personal liberation.

NEWYORKER: We Are Alive