The impact of the relationships Orrego-Salas enjoyed with his family, students, other composers, and musicians is visible throughout his compositions and life. It can be found in his dedications and comments at the end of his works, as well as in correspondence, in dedications to him from students and colleagues, and photographs showing his connections with fellow composers, musicians, and loved ones.
After meeting at Tanglewood, Aaron Copland and Juan Orrego-Salas maintained a relationship that can be seen in letters, dedications, and photographs over the decades. This includes Orrego-Salas's dedication of Variations for a Quiet Man to Copland. To Orrego-Salas, Copland dedicated the song, “Dear March, come in!” from his song cycle Twelve Poems of Emily Dickinson.