Pianolas are musical instruments that play pre-recorded music by means of a perforated paper roll. They were popular in the early 20th century and were often featured in homes, bars, and other public places. The word "pianola" is a trademark name for one type of player piano, but there are several other synonyms for this type of instrument. These include player piano, music roll piano, reproducing piano, and automatic piano. All of these instruments work by using a pneumatic system to play music without the need for a skilled musician, allowing anyone to enjoy the sound of piano music in their home or venue.