Final answer:
The intro to 'Tomorrow Never Knows' consists of a drum pattern and various sound effects, including tape loops and backward guitar.
Step-by-step explanation:
The intro to The Beatles' song 'Tomorrow Never Knows' is made up of two elements: a drum pattern and a set of various sound effects. The drum pattern is a simple but distinctive loop, known as the 'Tomorrow Never Knows' drum loop, created by Ringo Starr and used throughout the song. The sound effects include tape loops, backward guitar, and tape manipulation, which were innovative techniques used by The Beatles in their recording.