Alright, so I'm going to do my Top 50 list. splent, could you please change the thread title? Thanks.
Before we get started, a few words about my list. As I have already said, the focus will lie strongly on choral music - looking over my list, only six pieces are completely or mostly instrumental. The others are either orchestra and choir, choir a cappella or solo voice. This, I would say, is mainly due to the fact that I myself sing in a choir and therefore find it a lot easier to connect to vocal music, even though most of the music we sing (and, indeed, most of the music on this list) is sacral music and I, myself, am not a religious person at all. Not sure why that is, but anyway.
Let's get started!
50. Heinrich Schütz - Selig sind die Toten (1648)engl.: Blessed Are the DeadSchütz has never been one of my absolute favourites, even though our conductor is a huge fan of the guy and we have yet to sing a concert without at least one motet written by Schütz. Maybe it's because he's from our city and the music school of which our choir is a part of is named after him, I don't know.
Anyway, while I never loved most of his work, there are clear exceptions and this is one of them. Like most of his work, "Selig sind die Toten" features many interweaving melodies and lots of contrasts, but what seems formulaic in other works of his seems effortless and natural. The melodies here are especially strong and the contrasts between the "Sie ruhen von ihrer Arbeit" and the more energetic "Und ihre Werke folgen ihnen nach" that immediately follows make this one of the most interesting Schütz pieces that I know, both to sing and to listen to.
49. Felix Mendelssohn-Bartholdy - Herr Gott, du bist unsere Zuflucht (1877)engl.: Lord God, Thou are our refugeMendelssohn has always been one of my favourite composers, and basically everything that he has ever written is amazing, but I will limit to myself to three of his works, and this is the first. As with many things written by Mendelssohn, what really makes this amazing is the simplicity in its composition and how, despite that simplicity, the resulting piece is something that seems far more than the sum of its parts. Especially the softer parts ("Bist du Gott...") stand out for their majestic alto melodies and keen use of harmonics in a way that seems totally obvious and yet keeps you engaged and interested, again both as a performer and a listener.