If someone is interested, you can do this by installing python-grooveshark or python2-grooveshark package in ArchBsd

 sudo pacman -S python2-grooveshark 

You can find also some examples how to play the most popular songs or radio streams here: https://github.com/koehlma/pygrooveshar … r/examples
I have added the possibility to play playlists based on theyr id (the ending numbers from the url)

from __future__ import print_function
import subprocess
import sys
from grooveshark import Client
client = Client()
client.init()
for song in client.playlist(sys.argv[1]).songs:
    print(song)
    subprocess.call(['mplayer', song.stream.url])

Save the above code as playlist_grooveshark.py or whatever name you want and use it as\

python2.7 playlist_grooveshark.py 7508662

the last parameter is the id

I am using mplayer, but you could use also mpg123.

Assembly it is used in the development of Arch BSD?

No, we only provide a (in my personal opinion) better package manager for FreeBSD
This distribution is pure FreeBSD in the core, but it uses pacman instead of ports

Not really relevant in this case, but it's also (mostly) completely and utterly incorrect