I was educated (very well but not particularly enjoyably!) by the Jesuits like The Plumber and never heard mention of Opus Dei while at school. However, a ex-pupil did try to recruit me into it while I was at university. Being highly averse and allergic to any form of "secret society" and having learned a little about Opus Dei in the interim, I naturally declined. But I do know that they wield a fair bit of influence through their members in the establishment and business and this worrys me greatly.To bring a musical perspective in I never found the Js particularly strong in musical tradition (although the Christian Brothers had a strong "beat") and I don't believe music plays any significant role in Opus Dei activities.
Best regards,
mooman