Dreaming of linnets or other singing birds is very rare, but very good omen.
Dream dictionary: Linnets dream meanings
…the second place, to their insatiable love of foolish gossip. Now, however, as I gazed at the hideous countenance, and rubbed my eyes to make sure I was not dreaming, I felt that the gossip I had scorned was only too well founded, and I determined that nothing should induce me to sleep in that room again. The apparition was only visible for a very few seconds, and when I stirred it completely vanished. I have not only experienced this precursor of the occult myself, but I know others who have dreamed of ravens shortly before witnessing an occult phenomenon.I dreamed of a wren just before I got engaged to be married; and three of my correspondents always dream they see a wren prior to hearing of a marriage. Larks portend good news of friends and relations, and happy events generally. Linnets portend marriages; thrushes minor ailments and troubles….