When asked for their favorite Sesame Street seg­ment, many chil­dren of the 70s and 80s point to Pin­ball Num­ber Count. Psy­che­del­ic ani­ma­tion, the Point­er Sis­ters, odd time signatures—what’s not to love? But for the seri­ous Sesame Street buff, the “Jazz Num­bers” series above deserves the sil­ver medal. It’s got free jazz, Yel­low Sub­ma­rine-style sur­re­al­is­tic ani­ma­tion, and a vocal from Grace Slick of Jef­fer­son Air­plane. How many young par­ents rec­og­nized her dis­tinc­tive voice, I won­der? Also known as “Jazzy Spies,” this 1969 series of ani­ma­tions was devot­ed to the num­bers 2 through 10 (there was no film for “one” as it is the loneli­est num­ber that you’ll ever do), and was an essen­tial ele­ment in Sesame Street’s first sea­son. High­lights include the dream-like ele­va­tor door sequence of “2,” the Jack­son 5 ref­er­ence in “5,” and the rac­ing fans in “10.” Slick got involved through her first hus­band, Jer­ry Slick, who pro­duced the seg­ments for San Fran­cis­co-based ani­ma­tion stu­dio Imag­i­na­tion, Inc. Head­ed by ani­ma­tor Jeff Hale, the com­pa­ny also pro­duced the Pin­ball seg­ments, as well as the famous …