Seven is the song from Jill of the Jungle series, which is first heard in the ending sequence of the first game and makes a reappearance in two games of the series. The song features instruments and a style similar to the other songs in the game, but manages to give a positive vibe fitting to the game's ending.
The title comes from the file name, but Dan Froelich explained that the file names were in fact the proper full titles. The file in the game folder is named Seven.ddt.
Jill of the Jungle (DOS)
Jill of the Jungle: Jill Saves The Prince (DOS)
In third game of the series Seven can be heard in "The Valley" (level 1) and in "The Jail" (level 9).