How to count number of files in a folder?

The folder "_Current Assets" has 16 .wav files and nothing else. I'd like Applescript to get this number.
Below, the code that changed between trials is in bold
*Code tried:*
_Trial 1:_
set theFolder to "Macintosh HD:Users:dannykalman:Desktop:_Current Assets"
set numberOfAudioFiles to count of files in theFolder
display dialog numberOfAudioFiles
dialog says: 0
_Trial 2:_
set theFolder to "Macintosh HD:Users:dannykalman:Desktop:_Current Assets"
set numberOfAudioFiles to count of items in theFolder
display dialog numberOfAudioFiles
dialog says: 56
_Trial 3:_
set theFolder to "Macintosh HD:Users:mr:Desktop:_Current Assets"
set numberOfAudioFiles to count of *(files whose kind is "WAVE Audio File")* in theFolder
display dialog numberOfAudioFiles
dialog says: Can’t get every file of "Macintosh HD:Users:dannykalman:Desktop:_Current Assets".
I'm out of ideas : (. What would you suggest?
Thank you so much!

It worked because the path is in the correct syntax. BTW, the count is correct without the -1. Every folder that's been opened has a hidden .DS_Store file (which gets counted) that contains all of its properties, such as view, size, and location. Use the -1 if you want to suppress that file; however, it will count any other hidden ones. For AppleScript queries, use this forum. I had the Hosts move this post to it.

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