• Better branding through music: Original airport theme songs - USATODAY.com
  "They wrote on-hold music for the telephones, special elevator music and an airport "gong," a four-second piece of music called Happy Sky played before every overhead announcement in the airport."
• The Wire: Bang On A Can All-Stars: Music For Airports
  "From the June 1998 issue of The Wire - Adventures In Modern Music, kindly supplied and typed by Robert Phan"

There's more where this came from at del.icio.us/ambientmusicblog.