What movie is this? Early 80s

The year is 2007. I’m in my mid 20s and it’s the one year of my life where I lived alone right before I met my now wife. I think it’s summer time and I’m counting the days until that awesome football season. I go out to the bars with friends and come home at 2am-ish and flip through the channels. I have this special where I catch hbo, Cinemax and showtime. This movie was on one of those.

The movie is dated-it looks to be a typical surf and skin party movie from the early to mid 80s. Before you ask, I’ve already put it into the google machine and the “what’s this movie” website. Both searches were unsuccessful. Here’s what I remember:

1) there was an all girls rock band that looked to be a cross between the go-gos and Pat benatar. They were singing a song that could have been titled “What’s Going Down”. They were playing outside possibly by a swimming pool.
2) meanwhile a buxom young lady went into a changing room and showed some T&A. She was likely 19-24 years old and was unaware that a 50 something year old man (possibly either a landlord, janitor or maintenance man) was spying on her/voyeurism through a peephole.

That’s all I can remember. Any ideas what this movie is?