Try the latest "
Sample Application" available at Spotify :
http://opensource.spotify.com/cefbuilds/index.htmlRun cefclient and load any YouTube video to make sure you can hear the audio in that computer.
If everything is ok then try the web page you mentioned and select any big city in Spain. You will hear 90% of the stations or more after a few seconds.
Most of the radio stations in Internet use the MP3 codec included in CEF. Only a fraction of them use proprietary codecs like AAC.
Edit : MP3 support was added to CEF in March 2018 with CEF 3.3325.1746.ge81cdf2. Check that you use a newer CEF version.