It comes to pass that there are at least two Easter hymns in Bb in The Hymnal 1982: 1) He is risen, to Unser Herrscher, at no 180 (actually this is more effective in C) 2) Jesus lives! thy terrors now, to St Albinus, at no 194 (one of my top favourites!) 3) Come away to the skies, to Middlebury, at no 213 Some of these are also in The Hymnal 1940, and they may be in Worship IV and others
There is also the prelude and fugue in Bb in Bach's 'little eight' There is also Tchaikovsky's piano concerto in Bb-minor. It should keep you occupied!
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