Happy Heavenly Birthday to songwriter, and Eagles guitarist and vocalist Glenn Frey! Glenn began his career way back in the 60s in the Detroit rock scene. He co-founded the Eagles in LA in 1971, the group that of course went on to become synonymous with the music of the 70s, with hits such as Take It Easy (1972, written by Glenn as their debut single, peaking at number 12), One of These Nights (1975), and Hotel California (1977). 200 million albums sold and six Grammys is all you need to know in