itzblim / transposer

Chrome Extension for Transposing Chords

transposer v0.0.0.1

Transposer is an open source Chrome Extension for quickly transposing chords on websites.

Features

• Simple and quick way to tranpose all chords on a webpage to a new key:
  • Increase the key by one semitone (Ctrl/Command+Shift+Up)
  • Decrease the key by one semitone (Ctrl/Command+Shift+Down)
  • Tell transposer the current key and select a new key
• Automatically detects all chords:
  • Support for major, minor, diminished, added, sustained chords, chord inversions and more.
  • Does not modify other parts of a webpage
    • (e.g. the Am in American will not be detected as an A Minor chord)

Purpose

• Musicians often use online chord sheets.
• Many websites force users to pay for automatic transposition.
• Transposer works on any site that embeds chords as text rather than graphics.
  • Example:

Milestones

High priority

• Create a working backend
  • Identify chords in a website ✅
  • Transpose chords and replace original text ✅
• Create a working frontend
  • Allow users to select an adjustment (up/down semitones) ✅
  • Allow users to indicate the current key and select a new key ✅
  • Allow users to see the offset from the original key ✅
  • Allow users to return to the original key with a single click ✅
  • Allow multiple instances of extension in different tabs/windows ✅
  • Allow keyboard shortcuts to change the key ✅
  • Provide a user friendly interface ✅
  • Perform testing and resolve edge cases
• Publish on the Chrome Web Store

Medium priority

• Make a clean UI ✅
• Provide proper documentation for external contributors

Low priority

• Automatically identify the original key of a song

How You Can Contribute

Feel free to submit an issue / fork / pull request here!

Built by Benjamin Lim