It is no coincidence that Denver seems so charming when he works with Jim Henson's friends. Nothing, not even the dreadful earnestness Denver exhibits at his cloying worst, can stand up to the deflating freshness of Kermit, Fozzie, Rowlf, Gonzo and Co. And after all, anyone who sings a duet medley of Tumbling Tumbleweeds and Happy Trails with Miss Piggy, as Denver does on this LP, can't be all bad. When he presents his own songs, old J.D. can still seem to be on a pomposity high. This album includes his 1971 tune Poems, Prayers and Promises, featuring perhaps the worst line in the history of pop music: "It turns me on to think of growing old." But Denver seems like a genuine good ole boy on Gone Fishin', Mike Williams' Catch Another Butterfly and Andra Willis Muhoberac's No One Like You. There are also lively, likable versions of such favorites as Home on the Range (which Denver sings with Henson as Rowlf), She'll Be Comin' 'Round the Mountain and Down by the Old Mill Stream. Children should find this album a pleasant diversion, with a good mix of the familiar and the newly charming.