This is a very old story, repeated many times.  It was well written, easily recognized.  But it does beg the question, "why is it this way?"

 It was a truly enjoyable poem. I had my doubts in the first few lines but I loved "listening to old men grinding out a living and living a love playing live jazz." From then on you had me. Although it is true that this poem carries an old thought it is one that people like to see because it is an idea to which everyone can relate. Life can become so hectic that sometimes one really need to take a moment to relax and forget. Not only did you do that while you were listening to the jazz music, but you also give your readers a chance to do the same. Your words are our jazz music. By reading your poem I had a moment to break away. I was sitting with you listening to the band instead worrying about how I am going manage my crazy day. Although I don't think I really gave any helpful insights in this critiqe I just wanted to let you know that I aprreciated your poem and I wanted to thank you for the much needed break.

 You just need to change the  living  and living ,  To make this piece sound better.

at first when I read the poem I  wasnt able to follow it till I was past this first few lines.  but ,..

I just read it again now I understand what your trying to say, 

listening to old men

grinding out a living

and living a love of   (just add the of and it sounds better)

playing live jazz

This is from missunderstood's critique of this poem. I'd have to say that I disagree. I don't think that you should have to put the word "of" at the end of that line because the line break provides enough enjambment to clarify. However, I would suggest putting a comma at the end of the line instead of the word "of"; without a comma, it does get a little bit muddy and unclear, but adding a word isn't necessarily completely necessary.