I think the purpose for writing the poems were to express how the author feels about the subject of city expansion in the big yellow taxi . In the field below the it is a similar purpose to writing but I think he/she was a little more lonely.

The songs are not my type of music. but the big yellow taxi is a complete contrast to the tone of the original poem. The field below is a similar tone and emotion to the original because it is sad and depressing and weird.