Aaaah yes, i'm seeking it too (mostly TNT Portable).
As far as I know, in Taiko No Tatsujin Portable (1st one), also known as Taiko Drum Expert Portable, we can found ( sources (
http://www.playfrance.com/test-psp-taiko-no-tatsujin.html) ):
- Natsu Matsuri
- NO MORE CRY
- Neo Melodramatic
- Sakuranbo
- Tsubasa
- Hana
- Choo Choo TRAIN
- Mirai no Chizu
- TRAIN-TRAIN
- Omatsuri Ninja
- DANZEN! Futari wa Precure (Ver. MaxHeart)
- CHA-LA HEAD-CHA-LA
- Lum no Love Song
- Rewrite
- Ai wo Torimodose!!
- Touch
- Lupin Sansei no Theme '78
- Ignited -Ignited-
- WE WILL ROCK YOU
- Matsuken Samba II
- I'm A Slave 4 U
- TRUTH
- Mokusei Kumikyoku "Wakusei" Yori
- Turkey Koushinkyouku
- Walkure no Kikou
- Miwaku no Rhythm
- Entertainer
- Onpu no Uta
- Niji-iro Yume-iro Taiko-iro
- Donko no First Date
- Taiko no March
- Mojipittan Medley
- Mappy Ondo *
- Kata On The Rock
- Dragon Spirit Medley
- Scroll Mika
- Ridge Racer
- Yoku Deru 2000
Motsly J-pop and anime songs. If it can help in your request...