It gladdens my heart to confirm that Alexander Zemlinsky’s The Mermaid is no longer a “rescue” known only to early twentieth century enthusiasts panning for neglected musical gold. It’s too good for a fate like that. There are 11 modern versions of this work now on Naxos’s streaming site, not to mention live performances on YouTube, most of them, like this one, quite fine. The piece has arrived. It’s a fitting outcome for music which premiered in 1905 on the same program as Arnold Schoenberg’s Pelleas and Melisande and was actually preferred by the audience.