Fanfare in D-Major op.85

Craig Sellar Lang (13 May 1891 – 24 Nov 1971) was a New Zealand-born British organist, composer and music teacher.

Born in Hastings, New Zealand, C. S. Lang (known to his friends as "Robin") was educated at Clifton College,[ and was a pupil of Walter Parratt and Charles Stanford at the Royal College of Music.

He was an ARCM and received his Doctorate of Music from The University of Durham.

In 1929 he was appointed Director of Music at Christ's Hospital school in Horsham, West Sussex, to where the choristers of Westminster Abbey were briefly evacuated during the Second World War. An obituary recorded his "personal magnetism" and determination to awaken "the budding musicianship of every sort of pupil".

Lang resigned from this post in 1945 in order to devote more time to examining and composition. His instructional works, aimed at students, were highly influential.

Generations of organists were brought up on his Harmony at the Keyboard, Exercises in Score Reading, as well as his books entitled Exercises for Organists, designed to prepare organ students for the keyboard tests of the Royal College of Organists' diploma exams.