There are at least four bands with the name Dyad:

First one is a progressive death metal band from Zagreb, Croatia.

Second one is a solo project of Evgeny Gavrilov from Novosibirsk, Russia also known as member of FPRF band.
https://soundcloud.com/dyad

The third one is the Vancouver, B.C. trio of Kori Miyanishi (vocals, banjo, guitar, fiddle, jaw-harp), Leah Abramson (vocals, guitar) and Shiho Mizumoto (fiddles), who came together to play traditional American Old Time music after delving into everything from indie-rock and punk to classical and traditional music of various cultures. They are no longer active, though some of the musicians have continued with solo efforts.

The fourth one is a techno project of Ben Gibson and Fundamental Interaction.
They also run a record label under the same name. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.