It's true that old Conway occasionally seems to be courting a hernia when he strains to twist a high note. And Loretta is a mite too far past the boogeying stage to be singing about "getting down." But Twitty and Lynn are basically the Baskin-Robbins of country music duets: reliable, smooth and very comforting. With Conway typically Big Daddyish and Loretta in fine plaintive voice, they harmonize affably on 10 new tunes, from the inoffensively cute Oh Honey/Oh Babe to the sentimental I Still Believe in Waltzes to the energetic Lovin' What Your Lovin' Does to Me ("It's more movin' than the earthquake that shook up California"). They're married to other folks, of course, but as far as the peculiar chemistry of singing together goes, they're perfectly bonded.