LB,this is a huge subject with many differing opinions as to where exactly it applies. Basically, after the Temple’s destruction, The Rabbis forbade singing, playing, and listening to music. However, what is the subject of dispute is where and when this applies. Some of the applicable cases are parties with wine, or music while falling asleep or as you wake up.I think that’s why the post you referred to said “on a simple level”. There is so much commentary on this gemara, that it is hardly applicable in practice.
Like many things, if you are concerned speak to a competent, understanding Rabbi or Rebbetzin.