March 13 - In the US, Bryan Adams "Heat of the Night" becomes the first single to be commercially released on cassette. Cassette singles become known as cassingles[?].
April 23 - Carole King sues the owner of her record company, Lou Adler, claiming that she is owed more than $400,000 in royalties. King also asks for rights to her old recordings.
... and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) ...