I would like to be able to customize Unity's lenses, for instance to make Photo lens to search for photos in directories that I mark and the same rule for the music lens.
How can I do this ?
As for the Music lens I'm certain it doesn't work that way.
Since you use clementine, I've dug around and found that somebody is actually writing a scope for it, so you can use 'unity-lens-music' with clementine.
It is work in progress and doesn't work for me so far (I've installed it with clementine, to see if it works). It displays search results when you type, but it isn't able to start playback in clementine when you click on the song. Maybe you can find some additional help for that. To install the scope type