I'm slightly panicking here.
I don't keep local copies of songs in my iTunes library, instead streaming them on demand via iTunes Match, to save space on the SSD drive.
In certain situations such as buying music from a source different than iTunes, or if i decide to download an album for listening locally, the songs end up on my disc. So whenever i feel like it, i select all the music in the library and hit delete in order to delete the local files. My music is still stored on Apple's servers.
Today though, in a hurry, i must have hit the wrong button which, in a blink, deleted my entire library from iTunes Match. It disappeared from my iOS devices and from iTunes on my Mac without a trace. Gone. Help! is there a way to undo this step?
I should add, ~99% of my collection is not bought through iTunes, so it's not a matter of re-downloading previous purchases.
update: okay, shortly before this incident, i was adding an album to iTunes in ALAC format which i had reencoded from FLACs bought from boomkat.com - this was "exotic" music not available from iTunes, and the Match status said "uploaded" from all tracks. Now, when i added these same files again to my freshly wiped library, it didn't upload them. Sure enough, the status says "uploaded", but the process took like 2 seconds. The files were definitely cached on Apple's server, so I still have a little hope..