Rin Kagamine / Len Kagamine ( Twins )

Product Name (DTM) software, (Rin and Len, KAGAMINE RIN / LEN stoop) Rin and Len Kagamine is the name of a character and a desktop music speech synthesis has been released from Crypton Future Media. Was released on December 27, 2007 as the second of the following the Hatsune Miku became the blockbuster "(CV Series) Character Vocal Series". Approximately 20 000 to ship by July 2008, but does not extend to Hatsune Miku has recorded large sales as DTM soft [1].
Many songs have been published using the Kagamine Rin and Len in the heart of the video sites, some of which are sold as a music CD. I also there are many related products using the characters and other figures.

Their song :-

Miku Hatsune

Hatsune Miku (初音ミク^?) is a singing synthesizer application with a female persona, developed by Crypton Future Media. It uses Yamaha Corporation's Vocaloid 2 synthesizing technology. The name of the character comes from a fusion of the Japanese for first (初 hatsu^?), sound (音 ne^?) and future (Miku (ミク^?) sounds like a nanori reading of future, 未来, normally read as "mirai"^[1]), referring to her position as the first of Crypton's "Character Vocal Series". She was the second Vocaloid to be sold using the Vocaloid 2 engine and the first Japanese Vocaloid to use the Japanese version of the Vocaloid 2 engine. Her voice is sampled from Japanese voice actress, Saki Fujita. Hatsune Miku has performed at her concerts onstage as an animated projection.^[2]

Her Song :-