Derek Jewell 's weekly survey of popular music discovers COMMANDER CODY AND HIS LOST PLANET AIRMEN in nostalgic mood, reveals voices who may be here to stay in SHARON FORRESTER and RONEE BLAKLEY, and examines lOcc's preoccupation with the telephone. Another look at the major folk-rock compilation, Electric Muse, features the work of FAIRPORT CONVENTION, GRYPHON, DAVEY GRAHAM , JOHN RENBOURN and BERT JANSCH : records