“SPONTANEOUS INVENTIONS.” Bobby McFerrin. Blue Note 85110....

“SPONTANEOUS INVENTIONS.” Bobby McFerrin. Blue Note 85110. How long will it be before McFerrin’s unique vocal acrobatics become a tiresome comedy novelty? There are danger signs here: almost all the 11 cuts are partly or entirely wordless, and the novelty of hearing him dash back and forth between the squeak of the top register and the grunt of the bass is wearing thin. Still, varity is inserted via guest soloists (Herbie Hancock in the blues “Turtle Shoes,” Wayne Shorter on “Walkin’ ”). “I Hear Music” lapses into sing-along; “Beverly Hills Blues,” a duet with Robin Williams, is played strictly for laughs. It was probably all tremendous fun if you were at the Aquarius Theatre last February, but for repeated listening it’s 3 stars’ worth, tops. The “Night in Tunisia” cut (with Manhattan Transfer and Jon Hendricks) was borrowed bodily from the Transfer’s “Vocalese” album.