Bouzouki and helped elevate the bouzouki into a truly popular instrument capable of a wide range of musical expression. Recently the three-course bouzouki has gained in popularity. The first recording with the 4-course instrument was made in 1956. The Irish bouzouki, with four courses, a flatter back, and differently tuned from the Greek bouzouki, is a more recent development, stemming from the introduction of the Greek instrument into Irish music by Johnny Moynihan around 1965, and its subsequent adoption by Andy Irvine, Alec Finn, Dónal Lunny, and many others. This is the classic style of bouzouki, introduced around 1900, that was
How many angels can dance on the head of a pin? about how many could perch at the same time on the head of a pin"". Dorothy L. Sayers argued that the question was "simply a debating exercise" and that the answer "usually adjudged correct" was stated as, "Angels are pure intelligences, not material, but limited, so that they have location in space, but not extension." Sayers compares the question to that of how many people's thoughts can be concentrated upon a particular pin at the same time. She concludes that infinitely many angels can be located on the head of a pin, since they do not occupy any space there: