The venerable Rova Saxophone Quartet have been performing together for 40 years, so it’s not surprising that they have coalesced into a sound all their own. But that did not stop an intrepid collection of music lovers from settling into VAMP’s small and quirky space to hear two great ensembles. And it did not let up for the entire evening. As one can see at the start of the video, it was pouring rain that night.