In 1965, the Beatles began making promotional clips (then known as "filmed inserts") for distribution and broadcast in different countries—primarily the USA—so they could promote their record releases without having to make in-person appearances. Their first batch of promo films shot in late 1965 (including their then-current single, "Day Tripper"/"We Can Work It Out"), were fairly straightforward mimed-in-studio performance pieces (albeit sometimes in silly sets) and meant to blend in fairly seamlessly with television shows like "Top of the Pops" and "Hullabaloo". By the time the Beatles stopped touring in late 1966, their promotional films, like their recordings, had become highly sophisticated. In May 1966 they filmed two sets of colour promotional clips for their current single "Rain"/"Paperback Writer" all directed by Michael Lindsay-Hogg, who went on to direct "The Rolling Stones Rock and Roll Circus" and the Beatles' final film, "Let It Be". The colour promotional clips for "Strawberry Fields Forever" and "Penny Lane", made in early 1967 and directed by Peter Goldman, took the promotional film format to a new level. They used techniques borrowed from underground and avant-garde film, including reversed film and slow motion, dramatic lighting, unusual camera angles, and color filtering added in post-production. At the end of 1967 the group released their third film, the one hour, made-for-television project "Magical Mystery Tour"; it was written and directed by the group and first broadcast on the BBC on Boxing Day 1967. Although poorly received at the time for lacking a narrative structure, it showed the group to be adventurous music filmmakers in their own right.