If you're hunting for the original 'Beautiful' lyrics from 'Heathers', my go-to is always the official sources first. Start by checking the cast recording’s liner notes — digital stores like iTunes/Apple Music often include a booklet or credits that show lyrics or at least confirm the official wording. If it’s the stage version you mean (the musical by Laurence O’Keefe and Kevin Murphy), the licensed vocal score or the official piano-vocal book is the gold standard; those are sold through the musical’s publisher and include the definitive text.
Beyond buying the book, streaming services can help: Apple Music and Spotify now show synchronized lyrics (often powered by Musixmatch), so you can read along while listening and catch any tricky lines. For quick lookups I’ll sometimes peek at Genius or Musixmatch — they’re user-contributed but usually reliable for popular musical numbers. Just be mindful: crowdsourced sites can carry small transcription errors, so if you want the original, stick to the publisher’s score or the official cast recording materials. Personally, I love comparing a faithful score to a live cast performance to hear how different singers phrase the lines — it’s part of the charm of musical theater for me.