Build vs. Rent

"Rent everything that can be static. Build the one thing that has to be alive."

The First Question Anyone Asks

Songsterr exists. Ultimate Guitar exists. Capo exists. YouTube has ten thousand lessons. So the honest first question about a self-built music tool is: why build at all? If you can't answer that cleanly, you're about to rebuild a red ocean for fun.

The answer is a single distinction. Almost everything you need from a music tool can be rented, because it's static — it's the same for every learner:

Need                          Verdict      Why
----                          -------      ---
Note-for-note tab             Rent         Songsterr / Guitar Pro nail it
Chord charts / lyrics         Rent         Ultimate Guitar has millions
Audio → chords / key / tempo  Reuse libs   Capo proved it; librosa/madmom exist
"Simplify THIS to MY level"   BUILD        Impossible as static data — generated live

The One Thing You Can't Rent

"Take this solo and reduce it to what I can play today" cannot be a stored file. There is no Songsterr page for "the easy version for an intermediate player with small hands who's had three weeks on this scale." That answer has to be generated fresh — per song, per player, per level — which means a living engine, not a static library. That single requirement is the entire justification for Bonfire being an app at all. Strip it away and a set of links would do the job.

This is the build-vs-rent rule in general form: build only what can't exist as someone else's static product. Everything else is rented or reused — and reusing the boring parts (audio analysis libraries) is how you afford to build the interesting part (live simplification).

Conceptual Open-Sourcing

One more thing this quest is honest about: Bonfire's code is private. So what's being shared here isn't a repo to clone — it's the shape of the decisions. Why easy-mode over note-for-note, why one model, why an engine and not a DAW plugin. That's deliberate. The reusable thing about a tool like this was never the source; it's the reasoning. You can take that reasoning and build your own, on your own stack, for your own instrument. That's what "conceptual open-sourcing" means — and it's why there's no git clone at the end of this lesson.

Code

Rent what's static, build what must be alive·text

Need                          Verdict      Why
----                          -------      ---
Note-for-note tab             Rent         Songsterr / Guitar Pro nail it
Chord charts / lyrics         Rent         Ultimate Guitar has millions
Audio -> chords / key / tempo  Reuse libs   Capo proved it; librosa/madmom exist
"Simplify THIS to MY level"   BUILD        Impossible as static data

# The build is justified by exactly one row.
# If that row didn't exist, a page of links would replace the whole app.

Exercise

Think of a tool you wish existed. Split its features into two columns: 'rentable (static, same for everyone)' and 'must-build (generated live, different per person/moment).' If the must-build column is empty, you don't need to build — you need to combine links. If it has one strong row, that row is your blue ocean.

Hint

The must-build test: would the answer be a different file for two different users in two different moments? If yes, it can't be static — that's the part worth building.