diff --git a/util.mjs b/util.mjs
index ad9f58d6..0702c23b 100644
--- a/util.mjs
+++ b/util.mjs
@@ -2,7 +2,7 @@ export const isNote = (name) => /^[a-gA-G][#b]?[0-9]$/.test(name);
 export const tokenizeNote = (note) => note.match(/^([a-gA-G])([#b])?([0-9])?$/).slice(1);
 export const toMidi = (note) => {
   const [pc, acc, oct] = tokenizeNote(note);
-  const chroma = { c: 0, d: 2, e: 4, f: 5, g: 7, a: 9, b: 11 }[pc];
+  const chroma = { c: 0, d: 2, e: 4, f: 5, g: 7, a: 9, b: 11 }[pc.toLowerCase()];
   const offset = acc?.split('').reduce((o, char) => o + { '#': 1, b: -1 }[char], 0) || 0;
   return (Number(oct) + 1) * 12 + chroma + offset;
 };