It’s an Ableton Live-style launcher for triggering “clips” (audio and MIDI loops) from your keyboard. It’s used predominantly by people who are apparently incapable of working out musical arrangements in their head, as songwriters and composers have been doing for as long as formal music has been a creative endeavor.
It represents the seemingly inexorable slide into mediocrity and corresponding lack of musical ability. Of course, with AI on the horizon, these “producers” won’t even need to press a few keys on their keyboard to play back their “music.” They will be able to tell the built in AI, “Write me a song while I go make a sandwich.” That’s the logical conclusion to this sort of idiocy.