What surprising new song was introduced in the Led Zeppelin 4-CD boxed set in 1990?

Led Zeppelin were never renowned for releasing obscure material. That's why the box set released in 1990, barely 10 years after the band's demise, surprised many Led Zeppelin fans. The addition of "Travelling Riverside Blues," a previously unreleased song, was unexpected and a delight to fans.

Asked by Vasilii Kulev · Last updated 4 years ago · 7.8K views · SOURCE