LATEST ADDITIONS

I remember, though not well, when I acquired my first "10-speed" bike. My parents bought it for me at Sears. It cost about $100. It had a white frame with red and blue accents. It replaced one of those super-fun high-handlebar, banana-seat bikes some folks reminisce about . . . That would have been around 1978. Taking inflation into account, that bike would cost about $400 today.

Kiss on Wood, Rachel Yonan, viola; Kwan Yi, piano.; Shostakovich: Piano Concerti 1–2; Piano Works, Yuja Wang, piano; Boston Symphony/Andris Nelson; Begin The Song! A Purcell Academy, Paul-Antoine Bénos-Djian, countertenor; Le Consort; Chopin: 24 Préludes; Sonata 2, Emil Gryesten, piano.

Adam O'Farrill: For These Streets; Billy Mohler: The Eternal; Louis Stewart/Jim Hall: The Dublin Concert; Denny Zeitlin: With a Song in My Heart.

Imagine navigating the hectic rooms of an audio show at which a sea of similar-looking, similar-sounding gear blends into a predictable thrum, drawing a chorus of familiar nods. Then you stumble into the room occupied by Rich Pinto and his Treehaus Audiolab components. Here, the expected evaporates, replaced by designs that offer something different, both inside and out, sparking curiosity among jaded journalists and seasoned listeners.

Most audio engineers split hairs. Eelco Grimm splits microseconds. His expertise in high-precision audio laid the groundwork for Grimm Audio, the Dutch venture he cofounded in 2004 with fellow electrical engineer Guido Tent. The company's master clocks and DACs, developed for both the pro audio and home hi-fi markets, combat tiny timing errors and jitter that can blight digital audio.

Rollin' With Leo is a treasure from bebop's past that's been reissued several times on CD and LP since 1980. This new version, with its freshened sound, proves again that Dexter Gordon's concise appraisal of Leo Parker was on the mark: "The Kid could play. Lots of bottoms."