Mario Kart DS Codes: Music Modifier

This code will replace one song with another.
1xxxxxxx 00000yyy
xxxxxxx = Song to replace
yyy = Replacement song
Values:
Title Screen: 21DB4A4 - 174
Single Player Menu: 21DB4A8 - 180
Multiplayer Menu: 21DB4AC - 18C
WiFi Menu: 21DB4B0 - 198
Options Menu: 21DB4B4 - 1A4
Unused Menu Music?: 21DB4B8 - 1B0
Records Menu: 21DB4BC - 1BC
Grand Prix - Race Start: 21DB4C0 - 1C8
Course Intro 1: 21DB4C4 - 1D4
Course Intro 2: 21DB4C8 - 1E0
Course Intro 3: 21DB4CC - 1EC
Versus/WiFi Race Start: 21DB4D0 - 1F8
Battle Mode Start: 21DB4D4 - 204
Battle Mode Intro: 21DB4D8 - 210
Boss Intro: 21DB4DC - 21C
Cheep Cheep Beach: 21DB4E0 - 228
Yoshi Falls: 21DB4E4 - 234
Delfino Square: 21DB4E8 - 240
Airship Fortress: 21DB4EC - 24C
Waluigi Pinball/Wario Stadium: 21DB4F0 - 258
Peach Gardens: 21DB4F4 - 264
Luigi's Mansion: 21DB4F8 - 270
SNES Mario Circuit 1: 21DB4FC - 27C
SNES Koopa Beach 2: 21DB500 - 288
SNES Donut Plains 1: 21DB504 - 294
SNES Choco Island 2: 21DB508 - 2A0
GBA Peach Circuit/Luigi Circuit: 21DB50C - 2AC
GBA Bowser Castle 2: 21DB510 - 2B8
GBA Sky Garden: 21DB514 - 2C4
N64 Choco Mountian: 21DB518 - 2D0
N64 Moo Moo Farm: 21DB51C - 2DC
N64 Frappe Snowland: 21DB520 - 2E8
N64 Banshee Boardwalk: 21DB524 - 2F4
GCN Luigi Circuit/Yoshi Circuit: 21DB528 - 300
GCN Baby Park: 21DB52C - 30C
GCN Mushroom Bridge: 21DB530 - 318
Shroom Ridge: 21DB534 - 324
DK Pass: 21DB538 - 330
Desert Hills: 21DB53C - 33C
Tick-Tock Clock: 21DB540 - 348
Bowser Castle: 21DB544 - 354
Rainbow Road: 21DB548 - 360
Chain Chomp Theme: 21DB54C - 36C
Battle Stage Theme: 21DB550 - 378
Coin Mission: 21DB554 - 384
Boss Battle: 21DB558 - 390
Grand Prix - Placed 1st: 21DB55C - 39C
Grand Prix - Placed 2nd or Lower: 21DB560 - 3A8
Grand Prix - Placed 4th or Lower: 21DB564 - 3B4
Versus/WiFi - Placed 4th or Lower: 21DB568 - 3C0
Versus/WiFi - Placed First: 21DB56C - 3CC
Versus/WiFi - Placed 2nd or Lower: 21DB570 - 3D8
Mission Completion: 21DB574 - 3E4
Time Trial Completion: 21DB578 - 3F0
Time Trial Completion - New Record: 21DB57C - 3FC
Boss Mission Completion: 21DB580 - 408
Grand Prix - Results: (1st - 3rd): 21DB584 - 414
Grand Prix - Results: (4th or Lower): 21DB588 - 420
Versus/WiFi - Results: (1st - 3rd): 21DB58C - 42C
Mission Results: 21DB590 - 438
Time Trial Results: 21DB594 - 444
Versus/WiFi - Results: (4th or Lower): 21DB598 - 450
Final Lap: 21DB59C - 45C
WiFi - Trophy (1st): 21DB5A0 - 468
WiFi - Trophy (Tie): 21DB5A4 - 474
WiFi - Trophy (Lost): 21DB5A8 - 480
Grand Prix - Award: 21DB5AC - 48C
Grand Prix - Trophy (1st): 21DB5B0 - 498
Grand Prix - Trophy (Lost): 21DB5B4 - 4A4
Credits: 21DB5B8 - 4B0
Credits 2: 21DB5BC - 4BC
Fanfare: 21DB5C0 - 4C8
Fanfare 2 (Unused?): 21DB5C4 - 4D4
Star Power: 21DB5C8 - 4E0
Figure-8 Circuit/Mario Circuit: 21DB5CC - 4EC
'Here we Go!'/'Yahoo!': 21DB5D0 - 4F8
So, if you want the WiFi Menu to play Waluigi Pinball's music, you would create this code:
121DB4B0 00000258
The codes can be stacked, they don't need to be separate.