All six partbooks (for treble, mean, contratenor, tenor and bass voices as well as a sixth additional part or sexta pars) contain eighteen five- and six-part polyphonic Mass Ordinary settings for unaccompanied voices.
The sexta pars partbook (e. 381) contains in addition three English-texted anthems: Sing joyfully unto God (William Byrd); Almighty God which by the leading of a star (attributed to John Bull); and O Lord consider my distress (anonymous) [REF].