So sorry to hear about your Dad, just found these online:
Imagine - John Lennon
Wind Beneath My Wings - Bette Midler
My Way - Frank Sinatra
My Heart Will Go On - Celine Dion
Wonderful World - Louis Armstrong
The Power Of Love - Jennifer Rush
I Will Always Love You - Whitney Houston
Somewhere Over The Rainbow - Eva Cassidy
Fields Of Gold - Eva Cassidy
Bridge Over Troubled Water - Simon & Garfunkel
He Aint HeavyHe's My Brother - The Hollies,
Yesterday - Matt Monro
Albatross - Fleetwood Mac
Smile - Nat King Cole
Ev'ry Time We Say Goodbye - Ella Fitzgerald
Whatever Will Be, Will Be - Doris Day
Memories - Barbra Streisand
You're More Than A Number In My Little Red Book - The Drifters
Never Can Say Goodbye - Gloria Gaynor
Stairway To Heaven - Led Zeppelin
I love the idea of singing Wonderful World!
At my friends funeral we lsitened to High by The Lighthouse Family, if I remember correctlythey were very fitting lyrics.