This may be a nice one, a m-flo "two A-side" single including a song featuring Emyli & Yoshika, and another one with Wada Akiko ("Hey!").
"Hey!", which is being used as some baseball ending theme on TV, is said to sample other Wada Akiko songs.
m-flo "Loop In My Heart / Hey!"
1. Loop In My Heart
3. Let Go (Reggae Disco Rockers Remix)
4. Loop In My Heart (Instrumental)
5. Hey! (Instrumental)
6. Let Go (Reggae Disco Rockers Remix) (Instrumental)