Juicy Fragance (ジューシーフレグランス) is Perfume’s phantom song.

Nakata Yasutaka deleted by accident the data from the computer.
In the radio program Magical City on September 6th 2006 Kashiyuka said:

Kashiyuka: “At that time that was Perfume members favorite song”.

Nocchi: “Perhaps the company have the CD. A~chan is humming the tune.”

Even though it was played live it wasn’t yet registered at JASRAC.

• Source: Quick Japan issue #74 page 34.

In addition, I’ve cut that part of the program Magical City (20060906) so you can listen to the whole part about the song with A-chan humming it while Kashiyuka and Nocchi talk about their favorite and missing song.