"All of the Lights" by Kanye West is an example of a hip-hop song written in B-flat minor.
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"The Goat" heavily incorporates the 3rd movement of Frédéric Chopin's Piano Sonata No. 2 in B-flat minor, Op. 35, known famously as the "Funeral March".
Tchaikovsky - Piano Concerto No. 1 in B flat minor - Carl Bamberger Conducting (Columbia Records HS 11012, 1950s)