JD Souther, a songwriter who collaborated with the likes of the Eagles, has died at 78 as tributes already emerging. When we listen to music, we tend not to look past the name of the artist and the name of the song. That means there can be an assortment of people who worked on the track whose contributions may evade you. It’s not uncommon to have songwriters help out on a track, shaping a hit that is somebody out there’s favorite of all time. In the case of JD Souther, he had credits on a bunch that can be considered all-timers, especially if you’re a fan of the monumental American rock band t…