Is Crush 40 part of Sega?

Crush 40 is a Japanese rock band that is best known for composing and performing the music for the Sonic the Hedgehog video game series, as well as several other Sega video games. The band is not officially part of Sega, but has maintained a close working relationship with the company since the early 1990s. They are not employed by Sega, but instead work as independent contractors.