Music lover?

A story was related to me by a friend. He resides in a block of flats. As you often do, he became friendly with his neighbours.
Sadly, his one neighbour took ill and he withered away from around 140 KG, to a mere 50KG. The poor fellow was in and out of hospital, however, his condition only worsened. In the early hours of one morning, he left this world.

After a couple of months a teacher moved into the flat. He was completely in the dark that somebody had passed away in the flat, or in his own words, he would not have taken it.

It was not long after he moved in, in the early hours of the morning, his Hi Fi would turn on by itself. Even after taking the System in for checking, it continued to do the same. He then resorted to unplugging it. Other 'things' happened, but he apparently did not share these details with my friend.
When he learned that somebody had died in the flat, he gave notice and moved. My friend does not speak to the new tenants and is thus unsure of any further happenings in the flat.