A sprightly cadence figure in the first movement of the C major Quartet chirrups with ornaments instead of flowing in semiquavers.
A few bars into the G minor's Minuet, there is a new sighing dissonance from the first violin.
The cool harmonies of the work's Poco Adagio complement the outstanding cello contributions of Richard Lester, more familiar to some as a member of the Florestan Trio.
The London Haydn Quartet is a great team, especially in a D major Allegro di Molto which, as with other specimens of the composer at his most mischievous, fires in all directions - imagine a match dropped in a box of firecrackers.
And the gruff, wrenching accents of its Minuet make one wonder whether there is a drum somewhere in the mix.
Best of all, this exquisitely recorded set offers two discs for the price of one. Haydn, a practical soul, who took the trouble to note down an old sailor's recipe for preserving milk, would have approved.
Haydn: String Quartets Op 20
Hyperion, through Ode Records
Stars: 5/5
Verdict: "Cool and telling vindication of Haydn as Father of the String Quartet."