This Exposition presents a Double CD of Johannes Brahms’s Piano Quartets, recorded on period instruments in Vienna by The Primrose Piano Quartet for the Meridian label (CDE84650/1-2, 2019). The recording is presented in fully streamable MP3 format alongside a PDF of the CD booklet proof. Accompanying the recording is an essay which documents the research questions, methodology and processes underpinning the work. Preparation, rehearsal, recording and editing are discussed as a process of interpretative investigation. Historically-Informed Performance Practice with respect to Brahms is a thriving academic discipline within which we have endeavoured to offer the most radically innovative post-war commercial recording of the piano quartets.