There should be a formal prefix for when one adds BOTH lyrics and tune. And the shorter, the better, as the prefix eats into the limited subject line length. I've resorted to the prefix "ADD:", which I've seen a few others use; "Lyr/Tune Add:" is excessive. Posts with both lyrics and tune are especially useful, and deserve special recognition. As I understand it, DT gleaners are apt to miss submissions which do not use the "LyrAdd" prefix.

I also think the default subject line for follow-up posts should not include "LyrAdd"-type prefixes, just the "RE: " bit. All you can really expect in reply threads is that they'll deal with some aspect of the song, and whether lyrics or tunes were originally supplied or requested usually matters not at all. This does not apply to all prefixes; in particular, BS should NEVER be stripped, and "Origins" is useful to see in search results.