grace chatto of clean bandit elisabeth troy @ fib 2015. at 2015 coachella festival, group performed song disconnect , featuring vocals marina , diamonds. on 27 may 2016, released first single since march 2015, entitled tears , , features vocals x factor 2015 winner louisa johnson. song peaked @ number 5 in singles chart week after performed on britain s got talent. on 19 october 2016, announcement on facebook page stated violinist , pianist neil amin-smith had decided leave group. neil made separate announcement effect on twitter account. 2 days later, group released first song without amin-smith: rockabye , features rapper sean paul , singer anne-marie. rockabye became second number-one hit in uk, , remained @ number 1 9 weeks, , went on become christmas number 1 single 2016. song became international chart topper band, becoming number 1 in uk, republic of ireland, australia, new zealand, austria, denmark, finland, germany, italy, netherlands, sweden , switzerland , top 5 hit in