Ultimate Ears teamed up with Capitol Records in an effort to achieve aural perfection with their In-Ear Reference Monitors ($1,000). The headphones (if you can even still call them that at this price range) contain three proprietary balanced armature speakers that have been specifically designed for studio use.  The buds boast a consistent, flat frequency response that accurately reproduces every singe audiotory detail, so they can get those Autotune bits just right.