The term 'Black Keys' is a reference to the American rock band of the same name. The band, which was formed in 2001, is composed of Dan Auerbach and Patrick Carney. The band has released eight studio albums and has won several awards, including three Grammy Awards. The crossword solution for the term 'Black Keys' is 'Ebonies', which is a reference to the dark color of ebony wood. Ebony is a hardwood that is often used in musical instruments, such as pianos and guitars.