From the Super Mario Wiki
Drifting Away (Japanese: 声の漂う波間まで Koe no Tadayou Namima made, lit. "Drifting Voices on the Waves") is a song featured in WarioWare, Inc.: Mega Microgame$!. It serves as the background music for the gameplay portion of Dribble and Spitz's stage, playing on the radio while they drive a customer to the Diamond City harbor.
Drifting Away appears in the minigame Jump Forever, along with Four Seasons and the Jumpin' Rope theme. After Kat and Ana's stage is completed, this is the default tune until the player scores 100 jumps. The song also plays in the second level of Dr. Crygor's microgame Cymbalism.
In WarioWare, Inc.: Mega Party Game$!, the player can view a Drifting Away music video in the "Movie Matters" section. An excerpt of the song can also be heard in the "WarioWare, Inc. Medley" in Super Smash Bros. Brawl.
The song reappears as a record in WarioWare Gold.