Songs that make you cry at funerals?

My grandad died this morning and as i am the most musical person in the family , i was left in charge of the funeral music. I play acoustic guitar and my grandad didn't get to hear me play very often as i am a nervous player. I thought it would be nice if i plucked up the courage to sing and play at his funeral for him. Im not looking for sympathy but please give me any ideas of songs for funerals. Maybe soft country songs. And also any ideas of a song for me to sing and play on the guitar ? Oh if it helps , i am a girl and i am not vain but i have a very soft voice :) Thankyou!