Haim (band) spotted by musician Jenny Lewis at a jam session in Laurel Canyon, which led to Danielle joining Lewis' touring band. The Strokes' singer Julian Casablancas came to see one of Lewis's shows on tour, and he in turn asked Danielle to play guitar and percussion on his solo tour. Danielle rehearsed with Casablancas' band every day for two months, which she later described as "an eye-opening experience." Following working with Casablancas from late 2009 to mid 2010, she auditioned for a place in Scarlet Fever, the all-female backing band for CeeLo Green. Danielle performed only once with the group, on
Julian Casablancas drums and Eddie Vedder on backup vocals. The cover was released in 2006 as the B-side to "You Only Live Once". Casablancas also provided bass guitar and backing vocals on Albert Hammond, Jr.'s "Scared" on his solo album "Yours to Keep". He subsequently played a Casio guitar and provided backing vocals on "Sick, Sick, Sick" by Queens of the Stone Age. In 2008, he recorded a song with Santigold (then known as Santogold) and Pharrell of N*E*R*D called "My Drive Thru" for a Converse advertising campaign. During his solo phase, he recorded "Boombox" with Andy Samberg, Jorma Taccone, and Akiva