I wavered between a 3.5 and a 3 for this. I'll explain why.
As a romance, this works.
There's some contrived drama where the MCs really could have been a little more communicative and honest (and less presumptuous) but I get it, that's where the tension comes from.
The plot is good: I was intrigued by the premise -- it's a fun trope and clearly one that works, I mean Shakespeare made it popular, right?
I bought the story: we've got the musician who plays in a Symphony by day and rocks the underground clubs at night. Even though there's no question where the book is going, Welsh totally made that bit work.
I even looked for some of the tracks she's mentioned to add to my own playlist (sadly, only found one!) and found myself cheering for her (and her friends). Some other reviewers have thought she was spoilt and confused but I actually liked all the people in here: they were believable and worked their parts just right.
The problem I actually had was with the writing: long explications and most of the dialogue just didn't work for me; about a third of the book in, I nearly gave up. There is too much tell, rather than show and the only dialogues that rang true were at the club with Trinket; I am sure Welsh could do better, I was disappointed in this bit. But, clearly this still works for many readers -- who can turn this part off and work with a narrative VO in their heads -- and focus on the love story as well as the how long is Nyah/Queen Roe going to pull off her dual identities and when and how will they finally merge.
Still, there's all kinds of tension, all kinds of relationships that have to be manoeuvred and even saved, plus, of course, love!

Note: There is an explicit sex scene.