The Yahoo! Music LAUNCHcast Player works entirely through your browser, so you do not need any separate software. You do, however, need Flash Player for your browser, which is often already installed. If not, you can get the latest Flash Player plug-in (currently Version 10) for your browser here:
PC and Macintosh Users: Download Flash Player for All Platforms here
What type of Internet Connection do I need?
All radio stations are available to narrowband (dial-up) and broadband users.
Please Note: LAUNCHcast is not currently available with the version of Yahoo! Instant Messenger for Macintosh OS.