This book teaches the most crucial function of a chord instrument in the Celtic seisun (session) - that of playing tasteful, interesting, imaginative, and supportive improvised accompaniment. Celtic Back-Up presents accurate and directly applicable information on the theory, conception, stylistic considerations, procedures, and resources for accompaniment. Every facet of seisun accompaniment is thoroughly explored. With this book you will come to understand why many of our Celtic authors are reluctant to suggest chord accompaniment with their melodies in the first place; the idea is to be open to fresh ideas and improvise the accompaniment as you go. Includes access to online audio.