The phrase represents a musical association for a choir. Particularly, “SATB” signifies that the association is written for 4 voice elements: Soprano, Alto, Tenor, and Bass. “Martin” probably refers back to the composer or arranger of the piece. The preliminary phrases, “above the clear blue sky,” strongly counsel the title of the composition.
Such preparations allow choral teams to carry out items with richer harmonies and textures than can be doable with unison or two-part singing. The SATB format is an ordinary configuration for a lot of choral works, providing a steadiness of vocal ranges and permitting for quite a lot of musical results. The title itself might evoke imagery or feelings which can be then conveyed by way of the musical composition, enriching the listening expertise.