there's nothing to be said really except condolences. Tragedy comes into all of our lives eventually and it's pretty shitty, but life does go on. I would plump for songs that you would link to him in some way that'll bring the happy memories to the fore, or songs that'll cut deep and let you get some sort of catharsis, but that's me. I read a few words from the earth sea quartet at my dad's service and they were a sort of comfort to me. They're spoken in a sort of dry, grey land of the dead which is probably a metaphor for something to someone who has, in a way, given up life to be immortal and talking about another person.   

"Did you not understand that he, even he is but a shadow and a name? His death did not diminish life. Nor did it diminish him. He is there-there, not here! Here is nothing, dust and shadows. There, he is the earth and sunlight, the leaves of trees, the eagle's flight. He is alive. And all who ever died, live; they are reborn, and have no end, nor will there be an end.