Ubuntu :: Using Shell - Mailing Myself LS (or Any) Outputs

I have been having some fun with the shell but have become a little lost. I want to be able to email (myself and others) outputs from various commands etc. Sometimes people wish to know the contents of my music library etc and it's nice to be able to ssh in and email an ls (or similar) output.

Here is what I have been doing:
Code:
ls -R /home/simon/mount/sata0/audio > /tmp/musiclist
mail -s $(date +%Y%m%d) email@domain.com < /tmp/musiclist
The date part works perfectly and I receive an email with a subject suiting my preferential YYYYMMDD format.

But what I'd like to figure out is how to get this into a single line of code, my first attempt was:
Code:
mail -s $(date +%Y%m%d) email@domain.com < $(ls -R /home/simon/mount/sata0/audio)
This generates an error:
-bash: $(ls -R /home/simon/mount/sata0/audio): ambiguous redirect
But if I simply run the code "ls -R /home/simon/mount/sata0/audio" - the output is exactly what I want.

Is what I'm trying to do even possible? I do realise that I could use something like this
Code:
ls -R /directory > /tmp/file && mail -s $(date +%Y%m%d) email@domain.com < /tmp/file
But this is still running two commands and I'd like to figure out how to be 'cleverer'.