FASTER Contempory Romance

Hmm. Well, first thing. In the beginning of the query, you say your heroine "refuses to be another stop on his tour". Yet a fling is exactly what she expects. The story starts from the premise that she's exactly that, another stop. These two bits contradict each other.
When Louana Higgins stumbles into a fling with drummer Jake Riley, she doesn't expect much. It's an unplanned and delectable bonus, but he has a rockstar reputation. It can never be more. When he hops....
I feel the first sentence in the next paragraph would work better as a question. So why is the yummy drummer...? Usually, people don't think of themselves as "feisty brunettes". Definitely replace that with her name. Louana really doesn't want to think about... This paragraph may also benefit from a third "or" sentence, another thing she likes about him.
The part that is in brackets is unnecessary and clutters the sentence. Avoid brackets if you can. Also maybe leave aside what the lead singer will actually do. You're giving too much away. Come to think of it, is the lead singer even important? He's just the trigger, right? The problem is Jake's secret. As if long distance and groupies aren’t high enough hurdles, her new beau also comes with a wicked lead singer and more dirty secrets than Louana... (needs something snarky and character appropriate here).
To be honest, my feeling is that your third paragraph makes your query a little too much like a synopsis. Granted I'm no expert, but as far as I know, queries are more like blurbs, in the sense that they have to stir interest, not give the whole story away.
Why should the reader pick up this book if you're telling him exactly what is going on? They have a fling, then he asks her for a relationship, she agrees, then the villain gets in the way with the secret, and presumably at the end she forgives him.
Don't give everything away. Make the last paragraphs less tell-y. Leave something for the reader to discover.
Hope this helps

This is really good! I like your funny, charming voice. As a result, my suggestions are pretty minor.

It feels like there's a bit too much information packed into this. I'm not sure I need to know Louana is a dog walker or that there are other girlfriends backstage. In the girlfriends sentence in particular, I got lost in all the info.

I'm not sure I'd use "wicked" to describe the lead singer--feels too fantastical. Instead, a different adjective might also help answer some of the questions the others asked about what his motive is. (For example, "vengeful" tells me he has a grudge against Jake or "rumor-mongering" tells me he's just a gossip, etc.)

I love your opening and ending sentences. They make the stakes clear!

Thanks for all your comments and feedback. I appreciate your time and thoughts.

Good luck to all!