Magic Number Lyrics Follow

In computer programming, the term magic number has multiple meanings. It could refer to one or more of the following:
Unique values with unexplained meaning or multiple occurrences which could (preferably) be replaced with named constants
A constant numerical or text value used to identify a file format or protocol; for files, see List of file signatures
Distinctive unique values that are unlikely to be mistaken for other meanings (e.g., Globally Unique Identifiers)

Source: Wikipedia