July 1 [12:00 EDT] -- A benefit CD put together by Robert Plant for Rainer Ptacek, a Tuscon-based guitarist and dobro player with a cult following and a former member of the band Giant Sand, is due out July 8 on Atlantic.

The CD, called "Inner Flame: The Rainer Ptacek Tribute," features Rainer's songs performed by Plant, Led Zeppelin cohort Jimmy Page and a host of others including PJ Harvey, Dave Pirner (Soul Asylum), Evan Dando, Emmylou Harris, Madeleine Peyroux, Chris Whitley and Warren Zevon.

The 46-year-old Ptacek, who's played on some of Plant's recent recordings, was diagnosed with a likely treatable brain tumor earlier this year. The uninsured musician and father of three has wracked up well over $250,000 in medical bills.