Unlike America, the seiyuu is well known in Japan. They often are accomplished how to set up in ear monitors on stage and sometimes actors. You'll often find in the seiyuu ota's collection recordings of the seiyuu's unrelated music albums. Also, many times a seiyuu actress will sing the theme song of the anime they're in.
The whole was greater than the sum of the parts and if that had been the extent of the show everyone would have had a great time but P!nk has become known for her on-stage and above stage gymnastics and theatrics and this show had those and then some. The evening played to those strengths with a variety of winches pulleys trapezes and cages that elevated her ear monitors above the stage and all while she was singing and not missing a note.
You are probably thinking to yourself: Doesn't Mannheim Steamroller make New Age and Christmas music? And the answer is: Yes they do, but this is their one and only song written for dance clubs. It's featured on their second Halloween album, and also has a feedback music showing people doing a line dance created specifically for this song. Mannheim Steamroller is a pioneer of electronic music, and has been continually producing synthetic music since 1975. So, it wouldn't be fair to exclude them from the list just because they don't normally write in this genre.
This is the absolute best song for people watching. Ever. Every single time I have listened to this song while watching people, without fail, they have walked perfectly to the beat. Try it, I dare you to prove me wrong. It's especially amusing when someone is looking down trodden and walking slowly-as most people on campus look when walking to class-because the song is fairly slow and it seems they are walking that way for my enjoyment while listening to that song. Also, if I were making a music video, I feel like I could use any shot of people walking and talking and it would work. It's pretty amazing.