Cardboard Cowboy,’ a Grateful Dead original composition from 1966 will be part of a four-song CD that will ship with copies of Leshs autobiography Searching For The Sound sold at Powells.com. is set for an April 18 release and those who purchase the book at the Powells site will also receive a disc that includes the Grateful Deads final performance of ‘Box of Rain’ (7/9/95- Soldiers Field, Chicago) along with two jams, one of which features Brent Mydland and the other which features Bruce Hornsby. But wait theres morePowells is also offering a Phil Lesh-signed book plate to those who order their CD through their site (and quantities are no doubt limited so make that move soon).