If you want to search for a specific song, use the Advanced Search on the VWML Index Search Page. Use the 1st drop down (it shows All fields initially) to select eg Roud Number: 12 (or title or whatever you need to select the song), press + to get the next drop down and select Collector : Carpenter; press + again to get another drop down and select Source Contents: Audio. Then press Submit and that will get you any entries with audio (there's also a fragmentary audio too I think).

Mick