Learn a song by its numbers,
so you can play lead over it in any key.
A guitarist on stage doesn't need another chord sheet. They need to know what to play over the part that's happening right now.
Existing tools chart songs in fixed chord letters. The moment the band starts a song a whole step down, that chart is the wrong document.
Improvising softly behind a sermon close, in whatever key the backing track is holding.
Moving the congregation from one key to the next, song to song.
Remembering a song as "the chorus is 1 5 6m 4" — and knowing how to solo over it.
Murrsick never stores chord letters. A song's progressions live as Nashville scale degrees — relative to the key.
Because the degrees are relative, the same song map is instantly correct in every key. Key-independence is structural — not a transpose button bolted on afterwards.
One field changes. Every chord name, every suggested scale, the degree strip and the fretboard diagrams all re-derive at once — because none of them were ever written down.
app menu · tempo & metronome · key pad drone · key · theme
the seven in-key chords, always visible
Sections as ordered number maps. Selecting one makes it active.
What fits over the active section — plus the neck and the target tones.
The song as an ordered list of sections, each one typed as space-separated number tokens.
Add, rename, reorder, delete. Selecting a section makes it active — and the active section drives the centre display, the Scales module and the Arpeggios neck. Every other module is a lens on it.
For the active section, Murrsick ranks the section-wide scales that fit the whole progression, then the per-chord choices for each chord in it.
Strip the scale away and show only the chord tones, labelled by interval. It teaches you to spell a chord on the neck and to target it, instead of running a shape.
Pick from the active section, or from the key's diatonic set
Personal notes, not a chord sheet.
A capo value plus free text — key-change plans, how to sing a line on the guitar, tonal choices, the quirks you keep forgetting.
Time at the song's tempo.
Multiple click and feel modes, adjustable volume, and beats-per-measure under the hood.
A drone in the current key.
Hold a key between songs, or play softly over it behind speech. It follows the song's key automatically.
Any number token to a real chord in the key — 6m → Am in C. Degree-preserving across every key.
The seven chords and numerals of any major or minor key, plus chord tones for each.
Twelve scales — modes, harmonic and melodic minor, both pentatonics, blues — filtered for relevance to the key.
Which open-chord family a capo position gives you, and the capo that gets you back to a family you like.
Understand the song well enough
to stop reading it.