Vinyl LP pressing. Guitarist Wall Matthews is surviving member of experimental 70's collective, Entourage. Sampled by Four Tet, their name whispered in reverence through the decades, Entourage forged bold musical ideas on their two rare '70s Folkways LPs. Spine River : The Guitar Music of Wall Matthews, 1967-1981 is a collection of unreleased or obscure music by the master guitarist. This volume is a limited edition LP, along with four other digital volumes of Wall's music, chronologically mapping his career.