No studies to date examine the impact of arts-integrated preschool programming on the emotional functioning of low-income children at risk for school problems. The present study examines observed emotion expression and teacher-rated emotion regulation for low-income children attending Settlement Music School's Kaleidoscope Preschool Arts Enrichment Program. At a level of p less than 0.001, results indicate the following. First, within Kaleidoscope, children showed greater observed positive emotions such as interest, happiness, and pride, in music, dance, and visual arts classes, as compared to traditional early learning classes. Second, children at Kaleidoscope showed greater observed positive emotions than peers attending a comparison preschool that did not include full integration of the arts. Third, across the school year, children at Kaleidoscope showed greater growth in teacher-rated levels of positive and negative emotion regulation. The implication is that arts enrichment may promote social-emotional readiness to learn for low-income children at risk for school problems. (Contains 3 tables.)