Yep, 'Tubular Bells' by Mike Oldfield is indeed the theme from the 1973 film The Exorcist. It's funny because Oldfield didn't originally compose it for the movie, but its eerie vibe matched the film's unsettling feel so well that it became iconic on its own.

These days, you might come across a remastered version of 'Tubular Bells'. From what we found, Mike Oldfield worked on enhancing the original tracks to improve the sound quality—less hiss, clearer sounds, etc. New listeners seem to love how fresh and immersive it feels.

But not everyone is thrilled. Some long-time fans really dig the charm of the original recording and might be disappointed if they accidentally get a remastered version when they were hoping for the classic one they remember.

If you want the original The Exorcist experience, you might want to check out vintage or reissued vinyl editions of 'Tubular Bells'. Just keep an eye out for any 'remastered' or 'digital remix' labels in the product info to make sure you're getting what you want.

Whether you're new to it or revisiting the piece, 'Tubular Bells' has kept its haunting, iconic presence over the years.