The trouble with this topic is there's so much good stuff, from 700+ years of music. And what's popular is hackneyed and what's good isn't necessarily popular.
A few decent things that aren't what they seem. The Miserere that's not really by Allegri.
"Albinoni's adagio" that's nothing to do with Albinoni and a very good piece of craftsmanship by Giazotto.
And the Bach D minor toccata and fugue for organ that's probably neither by Bach nor originally for organ.
Actually I prefer the other Bach toccata and fugue in D minor