Caleidoscopio (カレイドスコーピオ) is a folk compilation album sung by Kagamine Rin and Kagamine Len. It consist of 18 tracks featuring tracks such as "Ophelia", "Hikari", and "Dideh o Shasta -the 15th bouquet-". With composers such as Lelele-P, Uta-P, and Orebanana-P. And with illustrators 7:24, △○□×, Nazekorewo-P and more.
It was first distributed in VOC@LOID M@STER 19. A mylist of the uploaded songs can be seen here and crossfade of the album can be heard here in Nico Nico Douga. The album was purchasable from Toranoana, however, it is currently sold out.
Their official website can be seen here.