[Kindred]

pawn Код:

if(sscanf(params, "s[256]", params))

^ Is that even possible? Isn't it like this?:
if(sscanf(stringtolookin, placeholders, variables to use))?

So I created a variable named url, and used it in place of params.

Try this:

pawn Код:

CMD:music(playerid, params[])
{
    if(!IsPlayerAdmin(playerid))
    {
        SendClientMessage(playerid, COLOR_RED, "You cannot use this command");
        return 1;
    }
    else
    {
        new string[128], url[128];
        if(sscanf(params, "s[256]", url)) return SendClientMessage(playerid, COLOR_WHITE, "USAGE: /music [url]");
        if(!strcmp(url, "stop", true, 4))
        {
            StopAudioStreamForPlayer(playerid);
            SendClientMessage(playerid, COLOR_RED, " You have stopped listening to music.");
            return 1;
        }

        format(string, sizeof(string), "An Admin Has Started A Song. Use '/music stop' to stop the song");
        SendClientMessageToAll(COLOR_ORANGE, string);
        foreach(Player, i)
        {
            PlayAudioStreamForPlayer(i, url);
        }
    }
    return 1;
}