Incidentals is the fourth ECM album by Tim Berne's Snakeoil, and the second with the five-piece line-up that adds guitarist Ryan Ferreira to the original quartet. It was recorded in December 2014, the same month and studio as You've Been Watching Me, and released on ECM in August 2017. The music is dense and fast-moving, yet every line stays audible. Berne himself said that "we somehow achieved more sonic space by adding another player".

Berne plays alto saxophone, with Oscar Noriega on clarinet and bass clarinet, Matt Mitchell on piano and electronics, and Ches Smith on drums, vibraphone, percussion and timpani. Ferreira came to the band through Mitchell, and he and Berne played as a duo for about a year before he sat in with Snakeoil. The session took place at The Clubhouse in Rhinebeck, New York, recorded by Daniel J. Goodwin. The producer was the guitarist David Torn, who also picks up his instrument for a short intro to the opener and at the close of Sideshow. Berne wrote four of the five pieces, and Mitchell contributed Prelude One / Sequel Too.

At 26 minutes, Sideshow is the centre of the record. It opens with a long piano introduction, and Ferreira's guitar drives its most heated passage before Torn solos over thunderous timpani and a serpentine sax and clarinet melody. Hora Feliz and Incidentals Contact each run past ten minutes and are built on the interlocking horn lines that have long marked Berne's writing. Berne insists the drums should never simply set up the time, and the rhythm here keeps bending. Many of the transitions, in his words, rest on Mitchell's shoulders.

In The Guardian, John Fordham called it "one of the most viscerally direct and exciting chapters in a consistently creative story", and noted the avant-rock guitar and timpani climaxes. For Tony Dudley-Evans in London Jazz News (2017), the guitar had significantly broadened the group's dynamic range. Cormac Larkin of The Irish Times admitted that beautiful was probably the wrong word for music so challenging, but heard in it something fresh, "even alarming".

This is the CD edition, ECM 2579, first released in August 2017.