It seems *extremely* unlikely to me that an alien species could develop a civilization that we could recognize and exchange information with that didn't have numbers. Any way we want to reliably communicate with aliens requires sending and receiving electromagnetic information on a specific frequency, and once you accept that, you kind of need some kind of basic concept of numbers. There really isn't any way for us to get information across light-year sized gulfs of space, unless you want to go completely old-fashioned like the voyager disk up there, and that's not nearly as efficient. If you buy into the whole 'DMT-entities-are-real-aliens' belief, you still have the problem of reliability and communicability (how often do you meet the same entities, and how often do other people meet the same group?)

It may be that this society has no concept of numbers, but (and I made this point above), numbers and mathematics are the thing that is *most likely* to be shared between us. It seems less likely that these aliens would be able to respond to music, or blueprints, or god forbid, language than they are to strings of beeps arranged in a particular pattern.

Blessings

~ND