Since his death in 1978, Louis Zukofsky has become widely recognized as a major American modernist poet of importance comparable to that of his friends Ezra Pound and William Carlos Williams. Unfortunately, of the little criticism of Zukofsky's work, much fails to take into account large stretches of his writings. The essays collected in Upper Limit Music examine all aspects of Zukofsky's work and all periods of his career. There are interpretations of his short poetry, of his epic-length "A", of his unconventional and groundbreaking fiction, and of his writings for the 1930s WPA project, the Index of American Design. This collection is an essential contribution to readings of 20th-century poetry and will prove an important resource for readers and critics of Zukofsky.