Jeremy Tepper, who over a long and varied career as a journalist, singer, label owner and radio producer championed the anarchic, high-energy music that straddled the lines separating country, rock, punk and plain old Americana, died June 14 in Queens, New York. He was 60. His wife, musician Laura Cantrell, said the cause of death, at Elmhurst Hospital, was a heart attack. Born in upstate New York and educated in Manhattan, Tepper was perhaps an unlikely apostle for a style of music variously called alt-country or outlaw country, but which he preferred to call rig rock the sort of sounds favored by long-haul truck drivers. Far from the big hats and ostrich-skin boots of Nashvilles Lower Broadway, it is the music one might hear coming from honky-tonks, jukeboxes, truck stops and big-rig radios, the corners of Americana that Tepper celebrated with unironic joy.