Robin Trower, 80, is one of the great British rock guitarists of all time. He started with Procol Harum from 1967 to 1971. His Bridge Of Sighs was one of the best albums of 1974. Chrysalis Records will release For Earth Below, which hit #5 in ’75, on June 27 as a four-CD box with all sorts of extras. After having experienced health problems last year which forced him off the road, he’s supporting the box with a mammoth tour. Besides 6/14 at Borgata in Atlantic City, he’ll play the Count Basie Performing Arts Center in Red Bank June 17 and The Wellmont Theater in Montclair June 18.