Program music 1970s in particular experimented with program music, among which was Rush's "Jacob's Ladder" (1980), which shows clear influences of Smetana's "Má vlast" ("My Homeland") (1874-1879). In addition, Rush's songs "Xanadu", "Red Barchetta", and "YYZ" also show their experimentalism with program music, as do parts of "2112", particularly the discovery scene. Composers and some theorists argue that there is indeed no such thing as true "absolute ("ars gratia artis") music" and that music always at least conveys or evokes emotions. While non-professional listeners often claim that music has meaning (to them), "new" musicologists, such as Susan McClary (1999), argue that so-called
ARS++ be called an ARS++ language. ARS++ ARS++ was developed in 2002 for the book "Undiluted Programming" to demonstrate ARS based programming in a real world context. ARS++ is used in the book to implement an A++ interpreter and an XML Database System. Even the implementation of ARS++ in C was used to demonstrate ARS-based programming. Principally the programming language Scheme would have been perfectly all right to be used for these demonstration programs if Scheme would include primitives supporting network programming, database programming plus a few others required in this context. The definition of the programming language Scheme does not