That song is Go Rest High on that Mountain. You can find the lyrics on pretty much any country music lyric site. Vince Gill and Ricky Skaggs recorded it as a tribute to Keith Whitley. It was a number 1 hit a few years back. I have heard it played at several funerals as well. Look up Ricky Skaggs or Vince Gill lyrics and you will find it. I think Vince Gill would be your best bet because I think it was Vince Gill with guest Ricky Skaggs is how it was released.