Shadows of Sounds by Alex Gray

Shadows of Sounds: The compelling Glasgow crime series by Alex Gray
When George Millar, the City of Glasgow’s orchestra leader, is brutally
murdered in his dressing room before a performance, his colleagues are
shocked. As the show goes on, DCI Lorimer and psychologist Solomon Brightman
uncover a series of irrevocably tangled relationships between the orchestra
members. Millar had been involved in a series of homosexual relationships and
was well known for playing his lovers off against one another – but were his
controversial dalliances really enough to incite cold-blooded and calculated
murder?