The present disclosure relates computer music generation methods and devices. The electroless plating bath for forming a Ni\u2014Re\u2014B alloy, containing not less than 50 at % of Re, on a substrate by electroless plating, has a pH of 6 to 8 and includes a metal supply source component containing Ni2+ and ReO4\u2212 at an equal equivalent in the range of 0. The computer application program may run on the computer system or on one or more other computer systems.