ピアノ×フォルテ×スキャンダル (Piano × Forte × Scandal)

ピアノ×フォルテ×スキャンダル (Piano x Forte x Scandal) is a song composed by OSTER-project and sung by Meiko; illustration by various Kochimu from Piapro. It's one of Meiko's most notable songs reached over 200,000 views.
 * Nicovideo broadcast
 * Youtube broadcast (with subtitles)

Background
The song was first uploaded on December 20th 2008, and is OSTER-project's first work using Meiko; various utatte mitas have covered the song. Unlike other works by OSTER-project; she'd made the instrumental first before making the vocals sung by the Vocaloids. It was then when she bought Meiko that she decided to use it as the vocals.

Also, in the album "Ms. Oster's BEST / OSTERさんのベスト" the song Piano x Forte x Scandal was featured there; with Meiko Append as the vocals (it's said to be Meiko Append judging by the album's crossfade and the tag Meiko Append in it)