The Theory of Parallel Universes) is a debut album by Polish rapper Medium (currently known as Tau) released on 21 November 2011 by Asfalt Records.

[1] The album was entirely rapped, produced and arranged by Medium except three remixes exclusively released on an LP edition which were produced by Qciek, O.S.T.R.

[2] The album received positive opinions both from listeners and reviewers who praised Medium's way of using various samples and ability to build "wide sound".

[3] Despite a little advertising campaign Teoria równoległych wszechświatów has sold eight thousand copies and Polish hip-hop portal conferred Medium the title of "revelation of the year".

[4] All songs were produced and arranged by Medium.