Brad Pitt and Pharrell have joined mourners at Soundgarden frontman Chris Cornell's memorial service at a storied Hollywood cemetery.

Soundgarden music played from a portable speaker outside the cemetery's gates as a group of about a dozen fans gathered outside. Chauffeured cars and sport utility vehicles arrived carrying mourners, including Cornell's widow and his two youngest children, for a private service on the Fairbanks Lawn at Hollywood Forever Cemetery. Rows of white chairs and floral arrangements were set out under overcast sky. Audioslave's Like a Stone played from speakers.

Brad Pitt attends a memorial service for Chris Cornell at the Hollywood Forever Cemetery. Credit:AP

Among those who came to pay tribute were Lars Ulrich and James Hetfield of Metallica, and Dave Navarro of Jane's Addiction.

The service will be followed by a public memorial and viewing of Cornell's final resting place.