A cool song for a memorial service would be Not Fade Away/Going Down The Road Feeling Bad by The Grateful Dead. The best version can be found on their album Grateful Dead (Skull And Roses).



I wanna tell you how it's gonna be, you're gonna give your love to me,
I wanna love you night and day, you know my love will not fade away.

You know my love not fade away, not fade away!

My love is bigger than a Cadillac, I try to show you but you drive me back,
Your love for me has got to be real, your gonna know just how I feel.

Our love is real, not fade away, not fade away!

Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
I don't want to be treated this away.
Goin' where the climate suits my clothes.
Goin' where the climate suits my clothes.
Goin' where the climate suits my clothes.
I don't want to be treated this away.

Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
I don't want to be treated this away.
Goin' where the water tastes like wine.
Goin' where the water tastes like wine.
Goin' where the water tastes like wine.
I don't want to be treated this away.
Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
Goin' down the road feelin' bad.
I don't want to be treated this away.
Goin' where the chilly winds don't blow.
Goin' where the chilly winds don't blow.
Goin' where those chilly winds don't blow.
I don't want to be treated this away.