Spanish moss (Tillandsia usneoides) is an epiphytical plant that uses trees as a perch. It is NOT a parasite. Older trees tend to have a denser Spanish moss accumulation. I think that Spanish moss makes trees look quintessentially 'southern'.
While the Vienna Choir Boys took off for South America in 1957, the photographers - 44 years later - made a pit stop in Savannah on their way down to Florida.