Ut re mi fa sol
William Byrd
SATB

Source: Musica Britannica 
Fitzwilliam Virginal Book

This arrangement duplicates the original keyboard work as closely as possible. A phrase may be be passed from one instrument to another. 

Bar 39: This bar presents difficulties as the two Es (E4) are out of range for the alto. 
As the alto is filling in the first chord an additional half note 'A' (A4) has been added at the start 
of the bar (ideally this would have been middle C, C4).

Bar49. This bar also requires a Bb3, out of range for both the alto and tenor. 
The alto is given a Bb4, i.e. an octave higher than in the original.

Bar 50. The first chord of the bar includes C4. The alto plays this note as C5.

Bars 78, 79. The tenor part is one octave lower than the original.