On December 1,1968, KPEN changed its call letters to KIOI ("K101"), dropped its block programming, and started adding more rock music to its MOR playlist, to compete with upstart freeform rock stations KMPX and KSAN.
KPEN changed its call letters to KIOI ("K101"). This was on December 1,1968. This was to compete with upstart freeform rock stations KMPX and KSAN. KPEN dropped its block programming. This was on December 1,1968. This was to compete with upstart freeform rock stations KMPX and KSAN. KPEN started adding more rock music to its MOR playlist, to compete with upstart freeform rock stations KMPX and KSAN. This was on December 1,1968.