Hi Gottfried, The project (≈package) named 'musescore' distributes a binary (≈command) named 'mscore':
~ λ ls $(guix build musescore)/bin mscore Don't ask me why they didn't call it 'musescore', but in general package names do not map 1:1 to binary names. That's why peeking in the /{s,}bin directories is helpful. An obvious example is 'coreutils', which provides most of the commands you use daily, but none named 'coreutils'. Kind regards, T G-R Sent on the go. Excuse or enjoy my brevity.