80,000 missing tango recordings
Pretty obvious actually - there are some I have that I could never use the background noise and scratchings are so bad you can barely hear the music.
Senor Varchausky and his team at the Tango Digital Archive have just completed the Pilot Phase of their project to digitise Every tango recording. His presentation showed us how the database will operate and how it will be possible to search a singer/orchestra/composer etc on their biography, their discography, movies, catalogues, published music and a number of other parameters. The bad news is that there is no government funding for this project of national importance to Argentina's tango heritage and TangoVia relies on donations. If they can get enough funding it will take 5 or 6 years to digitise the 100,000 identified recordings - and make them available to consumers in a system like (but much better) than itunes.
As you can gather, I am a complete convert... and I am now working out schemes for how I can help to raise a few dollars towards the project.
There's more about the Tango Digital Archive on TangoAustralia.