Tunes that are royalty-free are heard all over the place, from YouTube videos to car dealership commercials.

Unfortunately, many of such tunes are both unoriginal and definitely not my favourite sort of music.

Very often they get stuck in your head, too, because they're meant to be played on a loop!

Waltzing Matilda and other similarly often-sung songs do tend to get stuck in my head from time to time.

Xylophone solos never get stuck in my head.

Younger people may incur deafness in later life if they habitually listen to too loud music with indecipherable lyrics.

Zeal for music in people of all ages doesn't always cause hearing loss.

Audiences in buildings with poor accoustics might find it difficult to hear speakers or music if the sound is not turned up to full volume.

Building design is crucial to the intended use of the building, and one cannot discount the importance of good HVAC design to acoustics.

Co-incidentally, just as halls must enable audiences to hear speakers and music well, there are also many occasions where sound-proofing is necessary to block unwanted noise.

Divers factors must go into a successful building design, including acoustics, occupancy, budget, owner's expectations, etc.

Environmental factors such as heating and cooling a building are just as important as accoustics, whether it is designing a public building or an ordinary house.

Fire protection is also an important part of building design.

Granite, if polished, is a nice way of decorating public buildings, but it has faint radioactive properties.

Health and environmental concerns of building materials and design should always be considered.