The player needs a certain amount of music buffered before it feels comfortable about playing the music. If it doesn't have enough network / internet bandwidth to buffer that much, it will just keep trying and trying to buffer. Make sure that: your internet connect is fast enough, and that you're not downloading a lot while listening, ... .

If the above link for Winamp does not work, go to the 'File' menu, and click 'Play URL'. In the open URL field, copy and paste this address:

https://audiograted.com/streaming/audiograted.m3u