A track listed in a tracklist as "ID" because it is unreleased, unannounced, or unidentified.
Definition
"ID" is the placeholder used in published tracklists for any record that cannot yet be named — most commonly because the producer hasn't released it yet, hasn't yet announced an official release, or because the DJ playing it has been given an exclusive that they aren't allowed to identify. IDs are central to the trance ecosystem: producers send unreleased material to top DJs to test crowd response and build buzz before launch, sometimes for months or years. Famous IDs in DJ sets — when finally identified — often become major releases on the strength of their reputation. Listeners obsessively track IDs through 1001Tracklists threads and ASOT/Group Therapy radio shows. The "ID lifecycle" — debut → buzz → official release — is one of the trance scene's most distinctive promotional rhythms.