В начале раунда

#include <amxmodx>
#include <fakemeta>
#include <cstrike>

new const wellcome[] = "welcome_newerth.mp3"

new plugin_author[] = "shalm"
new plugin_version[] = "1.0"

public plugin_init(){
    register_plugin("Join_Music",plugin_version,plugin_author)
    register_cvar("join_music_version",plugin_version,FCVAR_SERVER)
    register_event("HLTV", "consound", "a", "1=0", "2=0")
}

public plugin_precache()
{
    engfunc(EngFunc_PrecacheSound, wellcome)
}

public consound(timerid_id)
{
        client_cmd(id, "mp3 play ^"sound/welcome_newerth.mp3^"", wellcome);
}