As suggested above, this is too tricky, 50 albums would be easier:
1. A concept album, either Tommy, The Who or The Wall, Pink Floyd
2. Blood on the tracks, Bob Dylan
3. Something funky, Maggot Brain, Funkadelic or possibly Sign of the Times, Prince
4. In a Silent Way, Miles Davis
5. Serenade for tenor, horn and strings, Benjamin Britten (ousting a Kate Bush album, which feels like betrayal!).