How do I get mt-daapd?
I think this is what you want.
sudo apt-get install forked-daapd
Quick tip
When you're searching for a package like this, try the following command:
apt-cache search keyword-here
So for instance,
apt-cache search daapd
Gives this:
forked-daapd - media server with support for RSP, DAAP, DACP and AirTunes