It was a tense American thriller from the 80s or 90s, about a young woman who lived on an upper floor in in a snazzy apartment block, who started getting mysterious phone calls and packages from a stranger. I think the woman was involved in modern art, and there were some scenes that took place in a modern art structure with recordings of steamy conversations that played when people walked through it. I recall there were some tense "Rear Window"-type scenes when someone was watching from across the street and saw the baddie had got into her apartment. I have a feeling there was a musician involved in the plot somewhere. Sorry this is hopelessly disjointed and vague...I'll be amazed if anyone manages to place the movie from such a haphazard description, but it's worth a try! 
