A Last Illusion

Starting Up
Spoiler warning: Plot and/or ending details follow.

Speak to any of the London brothers, depending of which one you talk to, you must get a determined piece of music:

Lance - Ode to Joy

Treo - The Flight of The Bumblebee

Finding them
They will tell you who could have the piece of music they need, each one will give you a list, people are located in the following cities:

Al Kharid: Lance - Prince Ali

Treo - Osman

Falador: Lance - Any of the King's Order, located in the White Knight's Castle

Treo - Sir Vyvin

Draynor: Lance - Diango

Treo - Wise Old man

Varrock: Lance - Museum's Information Clerk

Treo - Aubury

Please note that the person which you will find the piece is random, so you must go to all cities and talk to everyone in the list; when you finish with one of the lists (this means, when you find the piece of music) you must continue with the other.

Mixing
As a special gift, you decide to mix both songs in one, so you must again go back to Falador to find a group of musicians, you will find that only a Rock band is available, so you must give them the music pieces and they will produce the song, they will then give you the finished song in a CD, which you must give to Treo (because he has a Cd Player). Congratulations, Quest complete.

Rewards

 * 3 Quest points
 * 5,000 coins
 * A Last Illusion (RuneScape Version) Song for your Music Player