What defines a computer program?

A computer program is fundamentally defined as a sequence of instructions that the computer follows to perform specific tasks. This is the essence of programming, where a programmer writes code that tells the computer what to do step by step. These instructions are typically written in programming languages, which the computer can interpret and execute to carry out various functions, from simple calculations to complex algorithms.

The other options represent different aspects of technology but do not encapsulate the core definition of a computer program. While musical software falls under the category of applications that can be run as programs, it does not define what a program is. A graphical user interface is a way for users to interact with programs but is not a definition of a program itself. Lastly, hardware components refer to the physical parts of a computer and do not pertain to the concept of programming or software execution. Thus, the correct option underscores the fundamental nature of what constitutes a computer program.