It’s funny to think of Sean Lennon in an episode of the 1960s sitcom “The Dick Van Dyke Show.” But that’s just how he described recording “Acoustic Sessions,” a debut album he has released with his girlfriend, Charlotte Kemp Muhl, under the moniker the Ghost of a Saber Tooth Tiger.

“We perform the whole album with a Dick Van Dyke approach,” he said. “I play guitar while keeping time on a tambourine with my foot, plus occasionally hitting a cymbal in between strums as Charlotte plays accordion, banjo, melodica, acoustic bass, glockenspiel and shakers. It’s quite funny to see, because the whole juggling act could fall apart at any moment.”