I love the ending of his Op. 1, the first piano sonata, in C major, which he wrote when he was in his teens. http://www.gregsandow.com/music/brahms_ending.m3u Listen to it…doesn’t it just radiate teenage exuberance? I can almost hear him shouting, “I finished it! I finished it!” (And yes, I know that, despite the opus number, this was really the second piano sonata he wrote. But still I can’t believe he wasn’t thrilled to finish it.)