The late comedian's biggest hits weren't novelty songs, but earnest romantic ballads that challenged psychedelic pop in a mid-60s generation-gap war From a distance, Ken Dodd's musical career seems utterly bizarre. You could understand him having a couple of novelty comedy hits along the lines of Tommy Cooper's Don't Jump Off the Roof Dad or Charlie Drake's My Boomerang Won't Come Back, but Ken Dodd's records weren't…