[ryansheilds]

pawn Код:

CMD:play(playerid, params[])
{
    SendClientMessage(playerid, COLOR_WHITE, "Syntax: /play [station]");
    SendClientMessage(playerid, COLOR_GREY, "Stations: SlamFM");

    if(strcmp(params, "SlamFM", true) == 0)
    {
        PlayAudioStreamForPlayer(playerid, "http://www.true.nl/streams/slamfmlivestream.pls");
        return 1;
    }
    return 1;
}

Should work.