HP, The Ball, Music: Bach and Sting,

Bach: https://www.youtube.com/watch?v=S6OgZCCoXWc

Harry had long since read the full contract he had been Shanghaied into, including all the side portions he was to adhere too.
And, after the Dragon debacle, had Dobby get him the information on the next tasks ahead of time. So, he already knew what was ahead if he took someone to the ball. Or, conversely, that the headmaster was planning to use Ron. (Ummm, eeewwww. He wasn’t a poof like the headmaster obviously was.) So, either way a statement would be made. And he was already making plans on that front.

However, the ball was to have the Weird Sisters, and he contracted with them to do the opening piece, with doing the Bach’s Jesu Joy of Man’s Desiring on guitar. And the closing piece of If You Love Somebody, Set Them Free, By Sting, again on guitar. This time with vocals.
As such, since he was part of the entertainment, he refused to get a partner for the dog and pony show.

He had Dobby get him a new suit after the first task, and new strings for his acoustic guitar. And on the morning of the ball, after breakfast, He went off to the room he had commandeered as his own for Dobby to give his hair a magical haircut. After a complete shower. Then his first ever facial and shave.

After lunch, when the girls went to get ready, and the guys, outside to goof off, he was, again, in Dobby’s hands, as he got his teeth professionally cleaned and whitened, and subtle highlights in his hair for the lighting.
Afterwards, he worked with his guitar to warm up. Then re-tuned it properly for the first piece and handed it over to his friend to hold for him.
Walking down to where the other champions were waiting and getting detention for when school started by his Head of House for disgracing her.

Hermione’s date was Krum, and he made a mental note to have Dobby watch him to make sure nothing happened. Fleur’s date was mindless, and Cho was with Cedric. Both giving him pitying looks that he shrugged off.
Leaving with the excuse of the loo as desert popped on the table.

He was readying himself as the headmaster introduced the Weird Sisters and their Surprise Guest. Who was opening the night. And came out to the lone high stool and spotlight and sudden silence as everyone saw his guitar.

The tables had been removed and the champions ready for their opening dance as he poured magic into the classical piece by Bach. Making it all seem like a very beautiful dream that flowed over everyone, till fading on the last note. And getting a standing ovation.

The actual band came out and softly began to play for everyone else as the stool was popped off, and he walked off stage. Meeting a crying McGonagall and a somber headmaster. Both giving him points for his display and cancelling the detention, before they headed out front so he could relax.

He had Dobby watch Hermione to make sure nothing happened to her. And intervene if it did. And cooled down, while re-tuning for the last performance he would do for the night.
A performance that would state for all, his thoughts on the multitude of the stalkers out there.

He worked on finger stretches to keep them ready and limber and did his voice exercises under a bubble to get that ready. So, when he was called back to the stage for the final song of the night, he was ready.

Introducing the song and the creator, he began:

If you need somebody, call my name
If you want someone, you can do the same
If you want to keep something precious
You got to lock it up and throw away the key
If you want to hold onto your possession
Don’t even think about me

If you love somebody
If you love someone
If you love somebody
If you love someone set them free

If it’s a mirror you want
Just look into my eyes
Or a whipping boy, someone to despise
Or a prisoner in the dark
Tied up in chains you just can’t see
Or a beast in a gilded cage
That’s all some people ever want to be

If you love somebody
If you love someone
If you love somebody
If you love someone set them free

You can’t control an independent heart
Can’t tear the one you love apart
Forever conditioned to believe
That we can’t live, we can’t live here
And be happy with less
So many riches, so many souls
Everything we see we want to possess

If you need somebody, call my name
If you want someone, you can do the same
If you want to keep something precious
You got to lock it up and throw away the key
If you want to hold onto your possession
Don’t even think about me

If you love somebody
If you love someone
If you love somebody
If you love someone set them free

Set them free
(Free, free, set them free)
Set them free
(Free, free, set them free)
Set them free
(Free, free, set them free)
Set them free
(Free, free, set them free)
Set them free
(Free, free, set them free)
Set them free
(Free, free, set them free)

The music dimmed and only sporadic clapping from the females in the audience this time, and confused clapping from the males. Though the Veela’s were very enthusiastic in their applause. As were the band members.
He bowed to each; his message received.
Time would tell how well it sunk in.