Tony Bennett and Diana Krall’s partnership didn’t begin with the 2018 duets album Love Is Here to Stay. Krall popped up on two prior duets albums from Bennett and the pair toured at the dawn of the 2000s, but Love Is Here to Stay marks their first full record together, and it’s an elegant affair. Conceived as a tribute to George Gershwin, the album is filled with familiar tunes, but hints of imagination lurk around the edges, such as the revival of “Fascinating Rhythm,” the tune Bennett recorded for his first single in 1949. Nearly 70 years separate that version of “Fascinating Rhythm” from this 2018 rendition, and while Bennett certainly sounds older — his voice is slightly raspy, he can’t hit the high notes the way he used to, nor does he sing with quite as much force — he still sounds spry and commanding, happily dancing through these cozy melodies, singing with as much rhythm as lyricism. Krall responds in kind, trading staccato phrases that are slyly complementary to Bennett’s own. In the Bill Charlap Trio, the pair have empathetic support, keeping the proceedings both light and lush, helping to turn this album into a charming testament to endurance — endurance of the Gershwin catalog, the collaboration between Krall and Bennett, and, especially, how Tony Bennett can still sound completely committed to songs he’s spent decades singing.