'The loafer lagged along and asked,
"Do you make guitars here?
Do you make boxes the singing wood winds ask to sleep in?
Do you rig up strings the singing wood winds sift over and sing low?"
The answer: "We manufacture musical instruments here."'
(The Sins of Kalamazoo, Carl Sandburg)
Please help me to understand the two blue lines of the poem.
Cadzao