The Aprils celebrated last April’s Fool day (April 1st) with a special site (only available that day, now has been removed) with “idol” contents tributing Perfume.
The Aprils are a band formed by two guys and one girl. Their electro music is similar to Perfume or capsule’s and related artists… YMCK, RAM RIDER or Aira Mitsuki and also to some of the Contemode (Nakata Yasutaka label) groups.
That 1st of April they released a fake new single called Stainless Girl, a clear reference to capsule and Perfume song titles (capsule’s album and song name Sugarless Girl, and Perfume’s song Linear Motor Girl or the most recent Ceramic Girl). They also cosplayed as Perfume’s Complete Best CD jacket art, and even recorded a PV imitating Perfume’s Polyrhythm PV scenes and CG.
That video was uploaded by them to Youtube but was removed after that day… but I recovered the video file so you can watch it here:
capsule’s Flash Back album style:

Perfume’s Complete Best album:

And Perfume’s Polyrhythm CD/DVD cover art version:

• More about The Aprils
Time After Time (music video)
The Aprils: Works
Official Site (Jap/Eng)
• Perfume performed with SMAP Polyrhythm and Yozora no mukou, music re-arranged by Nakata Yasutaka.
• SMAP members as “Percume”
• More about SMAP