We don't have synonyms for songline yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sanguine, songlike and on-line.
(n) :
(Australian Aboriginal mythology) A path across the land (or sometimes the sky) marking the route followed by an Aboriginal ancestor made during the Dreaming; often recorded in traditional songs, stories, dance and painting; a dreaming track.
(n) :
(Australian Aboriginal mythology) A path across the land (or sometimes the sky) marking the route followed by an Aboriginal ancestor made during the Dreaming; often recorded in traditional songs, stories, dance and painting; a dreaming track.