Kol HaTorr
Rajmil Fischman - 1998

For see, autumn is past,
The rains are over and gone.
The flowers appear on the earth.
The season of glad songs has come,
The voice of the turtledove is heard
In our land
Song of Solomon, Ch2, 11-12

Kol HaTorr- the voice of Torr (the turtledove)- celebrates the arrival of our son, presenting a subjective image of his budding personality and cheerful disposition.

The sounds in the piece originate from recordings made when he was two and six months old. However, while the generation of the different types of sonic material and their treatment and interaction are purposefully intuitive, the structure of Kol HarTorr is based on a hierarchy resulting from experiments carried out in other works, which are particularly concerned with derivation of musical structure and generation of material from the solutions of differential equations. The aim of these experiments is to present the listener with various levels of articulation through which musical development may hopefully be perceived and apprehended, and also to provide identifiable directional axes throughout this development which may give the work a sense of unity and integrity.

The particular structure of Kol HaTorr is akin to the energy levels determined by the principal and angular-momentum quantum numbers appearing in the solutions of a well known cornerstone of quantum mechanics; Schroedinger's equation for a potential with radial symmetry. It consists of seven sections. Each section corresponds to an energy level determined by the principal number, which, according to quantum mechanics, sets the length and nature of each of the seven periods in the table of known elements. The duration of each section is proportional to the average atomic number of each period.

Sections are subdivided into subsections corresponding to atomic shells determined by the angular momentum number. The duration of each shell is also proportional to the average atomic number of its constituent elements and its character depends on the type of musical material associated with it. Therefore, every time a particular shell appears in a section, its material is re-encountered and developed further and, as a result of the increase in atomic number average, it lasts longer.