He mentioned it in his post Spooky.

The project was abandoned when the unofficial grooveshark api, we where using closed down, i did manage to get a Grooveshark Api Key (from grooveshark) for the official api, but the coder who was doing the project never recoded it to work with the official api and i never did either, you should be able to hire a coder here to do it fairly easily or you could move to youtube or another source of audio files, comes complete with well written terms of service, and about us page.
Halcyon Reviewed by Halcyon on . GetThatMP3.com - Music Site with HUGE POTENTIAL Hi, Get That MP3, is one of my projects, the domain is almost a year old, it was used a a MP3 Download website, basicly it would search grooveshark and then offer direct download. The project was abandoned when the unofficial grooveshark api, we where using closed down, i did manage to get a Grooveshark Api Key (from grooveshark) for the official api, but the coder who was doing the project never recoded it to work with the official api and i never did either, you should be Rating: 5