Music apps for the iPhone fall into a few distinct categories. Air, for example, is a freeform tool for creating random sounds, while JR Hexatone Pro is an advanced loop creator. PatternMusic, from ...

Venezuelan guitarist Aureo Puerta Carreño uses geometry to compose music. Handout Aureo Puerta Carreño makes geometry his muse. The Venezuelan guitarist, 28, created a method to compose music, using ...