duo for soprano saxophone in Bb and bassoon circa 12 minutes in duration.
notes: The instrumentalists play independently of each other. Music is cued to begin only with both instruments starting at the same time. There is no ‘fixed’ synchronisation between the instrumentalists. Whilst the relationship of each instrument is flexibly placed against its neighbour, care has been taken to calculate potential outcomes of coincidence and variability. To this end it is vital that metronome markings are adhered to as accurately as possible although the composer appreciates that it is the various interpretations and practicalities inherent in the realisation of tempi that contribute to the richly unique nature and interplay of each performance. Each instrumental part has a duration a little over 12 minutes. Both instruments should finish at approximately the same time. Compositional material is derived from a series of distant variations that unify all sections with thematic landmarks. Thematic material is audible throughout the piece, bringing cohesion and structure to the work. All the instrumental roles are written to a high degree of virtuosity and most contain extended techniques and quarter-tones. The music itself forms dense, highly complex and constantly changing relationships that are frequently wild and sometimes beautiful.
The score and parts: I have not produced a score for invoco; difficulties and variables associated with displaying the musical material in vertical alignment as represented in real time are considerable. Each performance will yield somewhat different results, interplays, gestural and harmonic references and outcomes. As a result, the material contained within the piece can only be read via the instrumental parts. Consequently there is no definitive performance of the piece. invoco can only be realised through performance [as opposed to comprehended by reading through a score]; this is the nature of the music – it has to be experienced to be ‘known’.
A note about the title: The addressing of a deity in a prayer or magic spell is the invocatio, from invoco, invocare, “to call upon” the gods or spirits of the dead. The efficacy of the invocatio depends on the correct naming of the deity, which may include epithets, descriptive phrases, honorifics or titles, and arcane names. The list of names (nomina) is often extensive, particularly in magic spells; many prayers and hymns are composed largely of invocations. The name is invoked in either the vocative or the accusative case. In specialised usage pertaining to augural procedure, invocatio is a synonym for precatio, but specifically aimed at averting mala, evil occurrences.
‘invocatio’ [Roman] wikipaedia