Many shows lay claim to be the first freeform radio program the earliest is Nightsounds on KPFA-FM in Berkeley, California, DJ'd by John Leonard. WFMU is currently the longest running freeform radio station in the United States. Jim Ladd of KLOS in Los Angeles, California is one of the most notable current freeform DJs. Tom Petty wrote a song about Jim Ladd called The Last DJ. The only time Jim Ladd doesn't have complete control over what music is being played is when he turns control over to his faithful listeners commonly referred to The freeform ethos tends to disdain playlists confined to a single music genre. However, DJs may opt to play selections according to an arbitrary theme . Freeform-ish stations that played only or almost only rock music were known as progressive rock stations.