At the start of the band's career, Cook would join Matt Helders and Andy Nicholson in backing vocals for songs such as "Fake Tales of San Francisco", but has gradually shied away from singing duties, leaving them to the other three members of the group.
Pada awal karier band ini, Cook akan bergabung dengan Matt Helders dan Andy Nicholson di backing vokal untuk lagu-lagu seperti "Fake Tales of San Francisco", namun secara bertahap menjauh menjadi backing vokal, meninggalkan mereka untuk tiga anggota lain dari kelompok.