During this period, he met Pierre Boulez, Karlheinz Stockhausen and Iannis Xenakis.

This series of concerts introduced Boulez, Xenakis and Edgard Varèse to the Filipino public.

His notable works include: Pagsamba for 116 instruments, 100 mixed and 25 male voices (1968); Cassette 100 for 100 cassette players (1971); Ugnayan for 20 radio stations (1974); Udlot-Udlot for several hundred to several thousand people (1975); Suling-Suling for 10 flutes, 10 bamboo buzzers and 10 flat gongs (1985).

In 1977, Maceda aimed to study Philippine folk songs which he describes as having more focus on rhythm rather than time measure.

His entire musical collections were inscribed in the UNESCO Memory of the World Register in 2007, as submitted by the U.P.