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I haven't listened to ALL of them (yet) but so far my favourite ones are "lament for Boromir" and "Song of Durin"

Facts

If you are wondering what Clamavi de Profundis is, it is a YouTube channel devoted to making very deep, moving music. They are especially noted for their adaptations of J. R. R. Tolkien's poems to music, although they are also incredibly talented in writing their own songs, too. Here is their latest LOTR music video: https://youtu.be/y2EnV6wunZY
Someone also started a petition for them to write some of the music for Amazon's upcoming LOTR video series. You can help here: https://www.change.org/p/amazon-have-clamavi-de-profundis-compose-for-amazon-s-lord-of-the-rings-original-series

They are awesome! My favorite one is The Song of Durin or Far Over the Misty Mountains Cold remix (the one that is 20 mins.)

Yes! My favorites are "Dragonshore" and "When the Hammer Falls".