My go-to tracks and reasons for;
Vanessa Carlton - Thousand Miles
Yep, everyone in the venue will be singing it for hours afterwards! It's a likeable song that won't upset people when they hear it several times. Nice clicky kick drum, snappy snare and a clean piano sorts the intelligibility issues out. Very soon starts to sound harsh if your tops aren't 100% spot on.
Philippa Hanna - Holywood
Not a very well known artist or song, but the production on this track (and the whole album!) is superb and it really does show a system's flaws up. An artist i've worked with too and it's nice to hear people at the end of my system check asking "who was that? She sounds incredible!".
Pirates of the Caribbean - Epica
Yep, a Dutch Metal band performing alongside a symphony orchestra. This one will wake your subs up! Double kick drum and a huge sound, yet because of the orchestral accompaniment and familiar tune it doesn't become tiresome.
The Zombie Song - Jamie Fletcher
Nope, you'll never have heard of this one either! It's a song that I produced, and I find that knowing a piece as well as that really does help highlight problems.
There are loads more. my love for musical theatre means my playlist has plenty of Cats (The Jellicle Ball especially), Hamilton, Wonderland etc.