We used to sing this in Intervarsity. It was written by John Foley S.J. and singing it at Celebration (now called Kairos) is one of my good memories. I love the minor key and the simplicity of it.

Refrain: The Lord hears the cry of the poor.
Blessed be the Lord.

Verses
1. I will bless the Lord at all times,
his praise ever in my mouth.
Let my soul glory in the Lord,
who will hear the cry of the poor.

2. Let the lowly hear and be glad,
the Lord listens to their pleas;
and to hearts broken God is near,
who will hear the cry of the poor.

3. Ev??ry spirit crushed, God will save;
will be ransom for their lives;
will be safe shelter for their fears,
and will hear the cry of the poor.

4. We proclaim your greatness, oh God,
your praise ever in our mouth;
every face brightened in your light,
for you hear the cry of the poor.
(HT: DragonMommie’s World)

The recording of the song that I own is by John Michael Talbot so I searched for one by him. I found one by the Brothers of St. Gabriel in Malaysia and Singapore that I like better though.