Imagine for a few moments that despite the difficulty a race has evolved in space, away from any atmosphere (perhaps a species of space jellyfish).
This race exists in a fairly 'noisy' nebula, but communicates over interplanetary distances using electromagnetic radiation, either in discrete bursts or as a constant flux. As such there is a time lag ranging from seconds (for 'intimate' encounters) up to tens of minutes at the maximum range of their 'voice'.
Is it possible for these creatures to develop a recognisable linguistic structure, given the time lag involved?