Psalm 10 is a song in which believers see lots of evil in the world around them and ask God to intervene and bring about his justice. This would be an appropriate song to sing in response to your sermon, especially the second half of the Psalm. o Seedbed Psalter o Reformed Churches in New Zealand (lyrics and sheet music) (audio)
1 About that time Herod the king laid violent hands on some who belonged to the church.