20 Progressive Fingerstyle Studies for Uke by Rob MacKillop. This collection of 20 fingerstyle studies for the ukelele is written for uke players looking to expand their prowess on the instrument. The studies cover a vast array of styles and genres as wide-ranging as blues, jazz, minimalism and serialism, showcasing the versatility of the instrument. Each study is designed to be fundamentally pedagogical while simultaneously written with performance and expression in mind.