This is what we found on Wikipedia regarding the Music of the Night:

Night & Day: Big Band is the eighteenth studio album by the American band Chicago, and twenty-second overall, released in 1995. It is a departure from Top 40 material for a more thematic project, with a focus on classic big band, jazz, and swing music.

Chicago left Reprise Records and started their own imprint, Chicago Records, to distribute their music. This album was carried by Giant Records, a subsidiary of Warner Music, who also distributes Reprise.

With producer Bruce Fairbairn, Chicago recorded Night & Day: Big Band from late 1994 to early 1995 and released it that May. Although Bruce Gaitsch joined the band and played guitar on the album sessions, the guitar slot would be filled by Keith Howland later that year. Joe Perry of Aerosmith was brought in to add a solo to "Blues in the Night".

The album reached #90 in the US, on the Billboard 200 chart.