First, added composer info from here:
http://bsm11084.hp.infoseek.co.jp/06.html
According to that, the mysterious 高木庸旬 could be Nobumasa Takagi. I haven't found any confirmation for this speculation of mine, but 高木 is usually romanized as Takagi, so the question is: 庸旬 could be romanized as Nobumasa?
Sincerely, I don't know.