Songsterr tab coverage = PUBLISHED/public tabs only (measured via api/songs?pattern=, fuzzy matches discarded). We make tabs by SUBMITTING the track to Songsterr, whose built-in AI transcription generates the tab from the OFFICIAL YOUTUBE AUDIO. IMPORTANT: many of our tabs are still UNPUBLISHED drafts in our 'My Tabs' account — they are not public, not in search, and not on the public CDN, so they are not captured here. Captured MIDI counts reflect public tabs only. Owned WAV/FLAC + Demucs/Moises stems is the separate full-quality path for audio analysis.