Just a few recommendations:-

Wedding Music

Bridal March - Wagner

Wedding March - Mendelssohn

Canon - Pachelbel

Arrival of the Queen of Sheba - Handel

Arabesque no.1 - Debussy

Classics

Ave Maria - Gounod/Schubert

Greensleeves

Tom Bowling - Dibdin

Gymnopedie no. 1 - Satie

O For the Wings of a Dove - Mendelssohn

Some examples:-

Songs from Shows and Film

Theme from Cats

The Phantom of the Opera

I Gather Lilacs from Perchance to Dream

Theme from Titanic

Lara's Theme from Doctor Zhivago

Popular Standards

Misty

My Foolish Heart

Days of Wine and Roses

I Get a Kick out of You

Tea for Two