“Hot Rize” is a bluegrass band that takes its name from an “ingredient” in Martha White brand flour and cornmeal. Formed in Colorado in the late 1970s , the band’s current line-up plays in Meymandi Concert Hall in Raleigh this weekend. Hot Rize is deep fried in bluegrass but as guitarist and founding member Tim O’Brien told Eric Hodge in a recent phone conversation, the four young fellows that formed band had interests that went beyond bluegrass.