C, around what year did you read this book? This will help narrow down the search?
Can you tell us more about the couple - their ages, is he a singer/guitarist/drummer, her job/student/skills/interests, rich/poor, how they met, love/hate at first sight, etc.?
What's the tone - romantic, angsty, steamy/clean, sad, funny, etc.?
This doesn't exactly fit your description, but has some elements in common so it's worth a go: 'Breathe' by Abbi Glines. The boy is a singer, his name is Stone, and he writes a song for the girl. They don't speak much for a while, but I'm not sure about the visiting at night thing. Apparently there is a new version of the book released in which there are 'more intimate' scenes, so you might have read this one. It's recent, within the last 10 years.
Can you tell us more about the couple - their ages, is he a singer/guitarist/drummer, her job/student/skills/interests, rich/poor, how they met, love/hate at first sight, etc.?
What's the tone - romantic, angsty, steamy/clean, sad, funny, etc.?
Tips for posting a book request - https://www.goodreads.com/topic/show/...