The Big Zane Theory is the second album by rapper, Zane (formerly Lil' Zane). It was released on August 19, 2003 through Priority Records. The album failed to match the success of Zane's previous album, as it only peaked at number 191 on the Billboard 200, with first week sales of 6,423 copies. The album also charted at number 39 on the Top R&B/Hip-Hop Albums.
Its only single, "Tonite, I'm Yours" peaked at number 87 on the Hot R&B/Hip-Hop Songs chart. As of 2024, the album sold close to 40,000 copies.[citation needed]