Development of Creative Commons licenses

["Matthew M. Gamble" <mgamble AT eol.ca>]

Greetings all,

Reading through the list archives, I can't seem to find an answer to my 
question - does playing creative commons music on a company telephone 
hold system count as "commercial use"? 

Secondly, how should the music be attributed in this scenario?  Reading 
the CC license, it is my understanding that the license (or URL to the 
license) has to be displayed.  Does this mean that if I want to use 
creative commons music in a music-on-hold situation that I have to speak 
out the URL to the license every 'x' minutes?  How often would 'x' be?  
Before each song? 

Thanks in advance for any clarification you can provide.

M. Gamble