It’s hard to listen to that song as performed.
Usually, Mick Dolenz was not the lead singer.
This shows why.
The song is written like a jazzy scat melody.
Picture Sammy Davis Jr. cutting loose with this one. Groovy Dance moves as well.
You need somebody with a strong and octave-flexible voice to carry that weight, so to speak. Davy could have done it justice. Mickey is a bit overwhelmed by the flow.
Like trying to sing “Supercalifragilistic” for 16 bars, nonstop.
Oh, I don't know: Mickey sang lead on a substantial number of their biggest singles:
"Last Train to Clarksville" - Mickey
"I'm a Believer" - Mickey
"(I'm Not Your) Steppin' Stone" - Mickey
"A Little Bit Me, a Little Bit You" - Davy
"(Theme from) The Monkees" - Mickey
"I Wanna Be Free" - Davy
"Pleasant Valley Sunday" - Mickey
"Words" - Mickey
"I Wanna Be Free" - Davy
"Daydream Believer" - Davy
"Goin' Down" - Mickey
"Valleri" - Davy
"Mary, Mary" - Mickey
"What Am I Doing Hangin' 'Round?" - Mike
"Listen to the Band" - Mike
"Shades of Gray" - Peter
"Sometime In the Morning" - Mickey (My favorite Monkees tune)