Well, this all depends on what atmosphere you want to create. One nice idea is to only play music from the era in which you were married. Or you could play your favourite tracks from over the years, starting with modern and working back (this will allow slower songs to going on longer, rather than ending up with Firestarter or Smack my B.*itch up!
If you were married in the forties, why not some of these:
"Oh What It Seemed To Be" (Frank Sinatra)
"You'll Never Walk Alone" (Judy Garland)
"Golden Earring" (Peggy Lee)
"To Each His Own" (Eddy Howard)
"So Tired" (Kay Starr)
"Peg O' My Heart" (Buddy Clark)
"Some Enchanted Evening" (Jo Stafford)
Or the Fifties:
'Beyond the Sea', 'Unchained Melody', Are you lonesome tonight? Papa Loves Mambo
Sixties
The Beatles, the Beach Boys, etc
Seventies
The Bee Gees, Disco Music
Eighties
Boy George, Bros,
Nineties
Take That, the Spice Girls
Today
If you were married in the forties, why not some of these:
"Oh What It Seemed To Be" (Frank Sinatra)
"You'll Never Walk Alone" (Judy Garland)
"Golden Earring" (Peggy Lee)
"To Each His Own" (Eddy Howard)
"So Tired" (Kay Starr)
"Peg O' My Heart" (Buddy Clark)
"Some Enchanted Evening" (Jo Stafford)
Or the Fifties:
'Beyond the Sea', 'Unchained Melody', Are you lonesome tonight? Papa Loves Mambo
Sixties
The Beatles, the Beach Boys, etc
Seventies
The Bee Gees, Disco Music
Eighties
Boy George, Bros,
Nineties
Take That, the Spice Girls
Today