The chorus of this song is made up of four-measure phrases. each measure is one duple-meter pattern (1-2). as you listen to this excerpt, count 1-2, 1-2, and you'll find that "hey mr. tambourine man, play a song for me" is four measures long. how many four-measure phrases make up one complete chorus? three four five six

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.