Show HN: Get the guitar chords from your Spotify playlists • Hacker News Board

Re: Show HN: Get the guitar chords from your Spotify playlists

#81

Post by heuermh » Tue, Dec 07, 2021, 4:30 PM UTC

rtsil wrote: post #68

scarecrowbob wrote: post #24

Earlier quoted context omitted.

I learned to play guitar back in the 90s when the OLGA was still a thing. UG sucks for precisely the reasons you mention. I suppose the trade-off is that now all the great folks who were making nice tab content are on YT, but still, if you'r business model is making money off aggregating a bunch of content people created in the early 00s because the love of it, then that's hyper lame. I still use UG if I am in a hurr…

OLGA was the Eldorado for my teen self. Its demise was a disaster. I still have a full copy of its archives somewhere collecting dust in my old hard drives.

I do too, let me know if you know/think of a good place to host these. UG must be one of the most user hostile resources I've ever attempted to use.

Re: Show HN: Get the guitar chords from your Spotify playlists

#82

Post by rodw » Tue, Dec 07, 2021, 6:10 PM UTC

cnity wrote: post #75

rodw wrote: post #72

Earlier quoted context omitted.

Can you expand on what you mean by "song recommendations" in this context? Do you mean recommendations like "if you like X you might also like Y"? Assuming the answer is "yes", I'm not sure if I follow the leap from "non-negative matrix factorization as a bank of note templates (from their spectrograms)" to "song recommendations". Very loosely speaking my (not wholly uninformed) interpretation of the "note templates"…

More likely, they mean using non-negative matrix factorization but with a bank of feature vectors instead of note templates. NNMF can be used in a wide variety of domains because it essentially encodes the problem of "this thing is a bit like this thing, a bit like this thing, and a bit like this other thing". If instead of numbers representing intensity at different frequencies (as in the spectrograms), the numbers…

Ack'd. That makes more sense. I guess I took the comment too literally.

Re: Show HN: Get the guitar chords from your Spotify playlists

#83

Post by notfed » Sat, Dec 11, 2021, 6:15 PM UTC

cannam wrote: post #33

notfed wrote: post #27

Earlier quoted context omitted.

As an amateur musician I see this as a missing holy grail killer app. I'd love to have it just to pull the chords out of some of my own old recordings that I can't figure out how to repeat. If anyone knows of any apps (even prototypes) that can do this, please provide links.

There are various commercial offerings that do this, including Chordify and Capo. Alternatively if you want a flexible free (GPLv2) option with source code, consider the Chordino plugin ( http://www.isophonics.net/nnls-chroma , C++ code at https://github.com/c4dm/nnls-chroma ) which you can run in Sonic Visualiser ( https://www.sonicvisualiser.org/ ), or indeed in Audacity. There is a reference describing the Chordin…

Success! Per your suggestion, I used Chordino plugin with Sonic Visualizer. I pumped in one of my old recordings and it showed me "B6" and "Dmaj7".

However, this was only so helpful. It would have been better if it showed me a fretboard and lit up which notes are active. Instead it just showed me e.g. "B6" which unfortunately has multiple implementations so I had to try many of the implementations across many capo positions, and it ended up being a "B6" that I don't even see documented in any chord guides, probably because I was using a capo. I was eventually able to find it by guess and check: randomly moving my fingers and capo around the fretboard then if it sounds close look it up to make sure it's "B6" in a reverse chord finder (i.e. oolimo.de). Still pretty painful for amateur me.

Perhaps the fact that a given chord has multiple implementations makes it impossible for the analyzer to know which one I'm using, but in my case I'm strumming all 6 strings so I suspect it's doable. Do you know if any tools can show the results as dots-on-fretboard? Or maybe I need a more thorough reverse chord finder?