The song is "Mr. Tambourine Man" by Bob Dylan.
The chorus is the following:
"Hey! Mr. Tambourine man, play a song for me
I'm not sleepy and there is no place I'm going to
Hey! Mr. Tambourine man, play a song for me
In the jingle jangle morning, I'll come following you"
If you listen to the first 30 seconds of the song, you can realize that the phrase
"Hey! Mr. Tambourine man, play a song for me" is a four-measure phrase; "I'm not sleepy and there is no place I'm going to" is a four-measure phrase and "In the jingle jangle morning, I'll come following you" is a four-measure phrase as well.
Therefore, we can say that the chorus is made of four four-measure phrases.