I disagree with the idea that music opens doors to the higher realms (with the exception of the chemically induced kicking in the doors as has already been mentioned).

When it comes to spirituality, for me at least, I find music to be perhaps the most superficial aspect of spiritual questing and/or having authentic spiritual experiences.

60s music hasn't been particularly long lived, and was pretty superficial for the most part. The songs people still associate with the civil rights movement were religious for the most part, like "We Shall Overcome" which always sounded to me like the flip side to "Onward Christian Soldiers". Not a song to my liking.

The great power of some 60s music, though not much of it, was the revolution in pop music, some of which is still with us today and/or has stood the test of time as truly great pop music. And there was some great anti-establishment music you would never hear in today's pro-establishment times.

None of my deeply spiritual experiences have human music as a soundtrack, but the sounds of nature are definitely part of them. Silence is a large part of spiritual experience to me, because contemplation or meditation or prayer (pick yer poison) is the essence of spirituality in my mind, along with living through tragic circumstances that tests us. Like the Asian tsunami, which reminds us all again that the force and power of nature is in charge here, regardless of our illusions to the contrary.