Orlando DiGirolamo was an American jazz accordionist, pianist, composer, and teacher. He is sometimes credited as "Lanny DiJay" on jazz recordings. DiGirolamo collaborated frequently with legendary jazz producer Teo Macero, and played on Macero's first commercial release, Explorations, also featuring Charles Mingus. He was described by Metronome magazine as an "extraordinary accordionist of the modern persuasion."

Accordions are a family of box-shaped musical instruments of the bellows-driven free reed aerophone type. The essential characteristic of the accordion is to combine in one instrument a melody section, also called the diskant, usually on the right-hand keyboard, with an accompaniment or Basso continuo functionality on the left-hand. The musician normally plays the melody on buttons or keys on the right-hand side, and the accompaniment on bass or pre-set chord buttons on the left-hand side. A person who plays the accordion is called an accordionist.