TOMMY BOYCE and BOBBY HART had recently scored a Hit "Single" , "I WONDER WHAT SHE'S DOING , TONIGHT" , followed-up by "OUT & ABOUT" (They performed That-One on "I DREAM OF JEANNIE" , but , for Some Unknown-Reason , This Recording wasn't-promoted very-well ... shoulda-been a Big-Hit , for-Them !!!
It is "performed" in the Party-Scene , in the Film , but I couldn't-see Either TOMMY BOYCE or BOBBY HART , Anywhere , in "the Band" !!!
I think the song is rather saccharine and cloying not to mention unimaginative - but it is catchy. Someone said to the composers, "Here's the title, write a song to go with it." So the composers just sang the title of the movie over and over. Don't take it personally, I really think it is an unimaginative song.