Another option is to type into your search engine “chant of le barroux”. You’ll have the text available by clicking of the tab that says “text”. The words will appear in Latin on the left and in English on the right. The Monks sing in Gregorian chant. I listen and pray with them every day.
If one want to sing the current Liturgy of the Hours in Gregorian chant there are many options (the monks of Le Barroux sing the Monastic Office which is very difficult for busy laity).
For the hymns, there’s Liber Hymnarius, available from Solesmes. For the day hours (Lauds, Terce, Sext, None, Vespers and Compline), the Communauté Saint-Martin in France have published the truly excellent “Les Heures Grégoriennes”). It’s Latin/French and entirely noted for Gregorian chant (you could use an English LOTH side-by-side with it for the English). It’s what I use most of the time (occasionally I pray the Monastic Office). I chant each psalm in Latin then read it silently in French (my mother tongue). It’s beautifully organized to minimize page flipping though some is inevitable, and has 4 ribbons (about 2 less than it needs alas…)
Les Heures Grégoriennes
The other cool thing about Les Heures, is that you can buy an optional 2 CD set of MP3s to help with the chant. The first strophe of every hymn; every antiphon and the first verse of the psalm or canticle it accompanies, every versicle and responsory, and common tones. A huge, huge help for learning how to chant the office in Latin.
For Vespers of Sundays, feasts and solemnities there’s Antiphonale Romanum II published by Solesmes. It’s also excellent, and very handy for choral use, but Latin only. Again you could use a vernacular LOTH side-by-side if you wish to read the psalm in the vernacular after chanting it. Antiphonale also includes the hymns for the offices it contains, as well as responsories, readings, psalm tones, in short everything you need to pray Vespers of Sundays, feasts and solemnities in one book.
Antiphonale Romanum II