Laetare Sunday

The origin of this Sunday's name;

 laetamini cum Hierusalem et exultate in ea omnes qui diligitis eam gaudete cum ea gaudio universi qui lugetis super eam. ut sugatis et repleamini ab ubere consolationis eius ut mulgeatis et deliciis affluatis ab omnimoda gloria eius- Isaias 66:10-11

Lamentably most parishes probably won't be singing the introit that is based on this part of Scripture.

What it sounds like in the simple English chant form:

Here it is in Latin:

Halfway through.