Library Suite is a song included in the Halo: Original Soundtrack.
The part from 2:02 to 2:20 features a Shepard tone effect.
The song plays in the Gravity lift hangar on The Truth and Reconciliation, the passage to the security control on The Silent Cartographer as well as the cutscene after shutting down the security override, at the beginning of Keyes, during the main menu, and during the level The Library. Part of this piece plays also on Halo: Reach matchmaking. Parts of it also appear during the installation process of Halo: PC.