On the Treasure Salvage screen (the screen that lists the treasures you collected), if you don't exit the screen and wait for about 4 minutes, a 19-note melody, which goes by the name of "Totaka's Song", will play. This was placed in Pikmin 2 by the game's Composer, Kazumi Totaka, who is known for placing the special music piece in many of the games he has composed for, such as Animal Crossing: City Folk (Wii) and Yoshi's Story (N64). This melody has been placed in 9 games (and is used twice in one of them), if not more. Interestingly, Kazumi Totaka is also the voice actor for the Pikmin.