2 other options that work with your link and are lightweight
Code:
wget -O - http://srv3.electro-music.com:8500/ | madplay -
and mpd (aka musicpd in FreeBSD) with the ncmpc front end. On my dual core amd both cpu's were around 0.4%. Mpd allows saving stream url's as a playlist. Mpd is also relatively easy to configure in OpenBSD. I store my mp3/flac in a single music folder in my home directory, edit a single line in /etc/mpd.conf to show the absolute path to the music directory, add myself to the _mpd group in /etc/group and set mpd to start in /etc/rc.conf.local.