[Konstantinos]

pawn Код:

enum e_InventoryItems
{
    II_Song[53],
    II_URL[110]
};

new InventoryItems[][e_InventoryItems] = {
    {"Sidney Samson and Martin Garrix - Torrent",               "http://k007.kiwi6.com/hotlink/s65e1e3suc/Sidney_Samson_and_Martin_Garrix_-_Torrent_mp3cut.net_.mp3"},
    {"Avicii - Wake Me Up",                                     "http://k007.kiwi6.com/hotlink/nudyhhx2fv/Avicii_-_Avicii_-_Wake_Me_Up_mp3cut.net_.mp3"},
    {"Die Antwoord - Rich Bitch",                               "http://k007.kiwi6.com/hotlink/rzw3kc240h/Die_Antwoord_-_Rich_Bitch_mp3cut.net_.mp3"},
    {"Calvin Harris feat. Alesso and Hurts - Under Control",    "http://k007.kiwi6.com/hotlink/6zctrsw8uf/Calvin_Harris_and_Alesso_-_Under_Control_ft._Hurts_mp3cut.net_1_.mp3"},
    {"Martin Garrix - Animals",                                 "http://k007.kiwi6.com/hotlink/hoz1u3oca1/Martin_Garrix_-_Animals_Official_Video_mp3cut.net_1_.mp3"},
    {"Hollywood Undead - Undead",                               "http://k007.kiwi6.com/hotlink/aj6ybbw6d1/Hollywood_Undead_-_Undead_mp3cut.net_.mp3"}
};

Check the "slot" parameter from the command if it's valid and use it as index:

pawn Код:

if (0 <= slot < sizeof (InventoryItems))
{
    PlayAudioStreamForPlayer(playerid, InventoryItems[slot][II_URL]);
}