I didn't read the other comments...
 
First off, that's a very pleasing saxophone sound and it was recorded very well.  I think that overall you have the basics of Sonar down but really you need to flesh out the arrangement of this piece.  This will keep the listener interested and in the process it will help you learn how to mix and arrange the instruments for a mix.  As is, this is not a complex arrangement so the mixing was not difficult for you I would imagine.  
 
I look forward to hearing more of those sweet sax sounds  :)
 
Allan
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Thanks a lot :) Im very glad you liked the saxophone :)
I will try to get more and more done in Sonar and I really love working with this program :)