Alternatively, many players will use their thumb and index / middle finger for faster «up - down» single note runs. (religion.blogs.cnn.com)
The day I went it was very cold and wet and it looked rather forlorn; a very bored gallery assistant was playing endless single notes on a piano. (artillerymag.com)
The work, produced as a musical composition, was performed with all the instruments in the orchestra lined up by pitch, from high to low, with each playing single notes in turn. (bard.edu)