Think about it. Have you ever seen a transformative, spiritual gig - then watched it back on TV to discover a squall of bum notes and missed cues? Live music is messy and spontaneous. Television demands perfection.
And so we find ourselves at last night's iHeartRadio awards (whatever they are) witnessing Rihanna perform her underwhelming new single Bitch Better Have My Money; and Madonna, wisely sitting down for once, as she duets with Taylor Swift on Ghosttown - aka the best song she's released since Sorry.
Guess which one is a thrilling, pulchritudinous showstopper, and which one sounds like a school assembly cover band?