Green’s Dictionary of Slang

ill music n.

In phrases

make ill music (v.) [SE ill, bad + fig. use of music]

a phr. used of unwelcome news, e.g. that makes ill music here.

[UK]B.E. Dict. Canting Crew n.p.: It makes ill Musick, of any unwelcome or unpleasing News.
[UK]New Canting Dict. [as cit. c.1698].