SMUS (Simple Musical Score) is an IFF-based music file format developed by Electronic Arts for the Commodore Amiga as part of the IFF 85 standard, serving as a lightweight alternative to the more complex CMUS (Complex Musical Score) format. It stores musical composition data including note events, tempo information, and instrument assignments in a structured binary format that is more compact than standard MIDI while optimized for Amiga sequencing software. The format was widely supported by music applications such as Deluxe Music Construction Set and Sonix, enabling efficient storage and exchange of musical works within the Amiga ecosystem.