Music is often used as part of a funeral service. It is common to play music that the deceased person enjoyed listening to. You might also decide to play music that reminds you of this person. There are no right and wrong answers with the music you choose for a funeral.
There are lots of websites with suggestions of music for funerals. Here are a few:
https://blog.funeralone.com/funeralone-products/life-tributes/funeral-songs/
https://www.loveliveson.com/top-ten-funeral-songs-of-all-time/
https://www.legacy.com/advice/top-funeral-songs/
Here are some songs that I think are good choices for a funeral. They might also be helpful to listen to whilst you are grieving and processing your loss. You can find an extended playlist here:
Day Dreaming - Aretha Franklin
The Only Exception - Paramore
Long Live The Queen - Frank Turner
I'll Be Seeing You - Billie Holiday
Starman - David Bowie
Do You Realize? - The Flaming Lips
My Way - Frank Sinatra
L-O-V-E - Nat King Cole
Somewhere Over The Rainbow / What a Wonderful World - Isreal Kamakawiwo'ole
You Are The Sunshine Of My Life - Stevie Wonder