Some music for a Requiem Mass apart from the sung parts of the Mass these can be helpful:

Entry Song:  

Just as Jesus died and rose, so those who sleep in him will be restored by God.
As in Adam all have died, so all will live in Christ, will live inChrist.
Glory to the Father, glory to the Son, gory to the Holy Spirit now and for ever. Amen.

 

The Psalm

Psalm 129: Come to me and I shall give you rest.

Before the Gospel

Alleluia, alleluia.  Alleluia, alleluia.
If we have died with Christ then we shall live with him, if we hold firm then we shall reign with him.
Alleluia, alleluia.  Alleluia, alleluia.

 

after communion

I know that my redeemer lives. On the last day I shall rise again.
And in my flesh I shall see God, the living God.

 

After Mass
How blest are those who’ve died in the Lord,
let them rest from their labours for their good works go with them.
Eternal rest give not them, O Lord, and let perpetual light shine on them.
May they rest in peace.