ふたりのうた -RL DUO Collection- (Futari no Uta / Our Songs -RL DUO Collection-) is a compilation album by G.C.M Records and is a collection of newly written songs. It contains 16 tracks, all sung by Kagamine Rin and Kagamine Len. It comes with a 20-page booklet, which contains artwork by over 20 illustrators, one of them being 7:24. Notable producers such as Hidarigawa Slash, emon(Tes.), and Dios/Signal-P (who also did the mastering) are featured; Ann-Melts P is the organizer. It was first released at the Kagamine Tone event in Tokyo, and later at THE VOC@LOiD M@STER 23 and Comiket 83.
A crossfade of the album can be heard on NicoNico.
The album is purchasable on Toranoana.
- A Kagamine only event is to be held in Tokyo, called "鏡音ねいろ！ (Kagamine Neiro/Tone)". It is scheduled for November 25th, 2012, the same date as the album release date.