[Minoost]

By forcing m_nMusicID to certain value, you can give a music kit to players!
Note: I don't know why, but m_nMusicID is being reset every frame by game and very glitch.

MUSIC ID:
1,2 - CS:GO Default 1, 2
3 - Daniel Sadowski, Crimson Assault
4 - Noisia, Sharpened 
5 - Robert Allaire, Insurgency 
6 - Sean Murray, AD8 
7 - Feed Me, High Noon 
8 - Dren, Death’s Head Demolition 
9 - Austin Wintory, Desert Fire 
10 - Sasha, LNOE 
11 - Skog, Metal

Example (Youtube)
Example 2 (Youtube)

EDIT:

Originally Posted by psychonic It is likely being recopied to the player resource object on every think, like many other values on it. It is largely just a clone of values existing on the player class, but instead networked to all players, rather than just self or players in PVS.

Thanks to psychonic, I just found better way to handle it.
In this way, you don't need to change m_nMusicId on every frame.

public OnPluginStart()
{
    RegConsoleCmd("sm_setmusic", Command_Music);
}

public Action:Command_Music(client, args)
{
    new String:command[8];
    GetCmdArg(1, command, sizeof(command));
    new id = StringToInt(command);
    
    SetEntProp(client, Prop_Send, "m_unMusicID", id);
    return Plugin_Handled;
}

[Neuro Toxin]

Nice

[psychonic]

Originally Posted by Minoost Note: I don't know why, but m_nMusicID is being reset every frame by game and very glitch.

It is likely being recopied to the player resource object on every think, like many other values on it. It is largely just a clone of values existing on the player class, but instead networked to all players, rather than just self or players in PVS.

[Minoost]

Originally Posted by psychonic It is likely being recopied to the player resource object on every think, like many other values on it. It is largely just a clone of values existing on the player class, but instead networked to all players, rather than just self or players in PVS.

Ah, that explains a problem. Thanks.