.htaccess redirect issue

[rkstevens]

I am using the statement:

redirect permanent audio/ http://www.newsite.com/audio/

since I have moved the audio files to a different site. The redirection works, but only for the top level. So:
oldsite.com/audio/file.wma becomes newsite.com/audio/file.wma
as it should. However, I have nested directories within my audio folder to keep things organized, and
oldsite.com/audio/classical/file.wma
does not redirect to
newsite.com/audio/classical/file.wma
as I would like it to do.
How can I specify this in my .htaccess file without having to do a redirect for each folder?

[davebarnes]

try
redirect permanent /audio/ http://www.newsite.com/audio/

has one more slash