We are up to Psalm 27 over at Robert's PsalmChallenge.
Jews are supposed to sing, read, or study this psalm every day in the present month of Elul as we prepare for the spiritual account-taking of Rosh Hashana and the Days of Awe.
I refer you to the Velveteen Rabbi blog, where Reb Rachel has many good ideas and links about Psalm 27, such as a modern poetic translation by Rabbi Zalman Schachter-Shalomi.
This psalm has become beloved in Christian tradition as well.
Taize, the monastic community in France, has two songs from Psalm 27 alone.
A haunting singing of Verse 1 can be heard here.
"The Lord is my light and my salvation, In him I trust, In him I trust."
The other Taize song comes from Verses 13-14:
"I am sure I shall see the goodness of the Lord in the land of the living . . .".
See all the words and notes below
and hear it sung at Taize here.