diff --git a/src/file.ts b/src/file.ts
index 4ef738a..fb92b16 100644
--- a/src/file.ts
+++ b/src/file.ts
@@ -1,7 +1,6 @@
 /* eslint-disable no-extend-native */
 /* eslint-disable @typescript-eslint/no-unsafe-return */
 
-import scoreinfo from './scoreinfo'
 import { ALL, webpackGlobalOverride } from './webpack-hook'
 import { console } from './utils'
 
@@ -53,8 +52,8 @@ const magics: Record<FileType, Promise<string>> = {
   mp3: magicHookConstr('mp3'),
 }
 
-const getApiUrl = (type: FileType, index: number): string => {
-  return `/api/jmuse?id=${scoreinfo.id}&type=${type}&index=${index}&v2=1`
+const getApiUrl = (id: number, type: FileType, index: number): string => {
+  return `/api/jmuse?id=${id}&type=${type}&index=${index}&v2=1`
 }
 
 const getApiAuth = async (type: FileType, index: number): Promise<string> => {
@@ -87,8 +86,8 @@ const getApiAuth = async (type: FileType, index: number): Promise<string> => {
   return magic
 }
 
-export const getFileUrl = async (type: FileType, index = 0): Promise<string> => {
-  const url = getApiUrl(type, index)
+export const getFileUrl = async (id: number, type: FileType, index = 0): Promise<string> => {
+  const url = getApiUrl(id, type, index)
   const auth = await getApiAuth(type, index)
 
   const r = await fetch(url, {
diff --git a/src/main.ts b/src/main.ts
index 012e5d8..db87a74 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -6,12 +6,13 @@ import { downloadMscz } from './mscz'
 import { getFileUrl } from './file'
 import { WebMscore, loadSoundFont } from './mscore'
 import { BtnList, BtnAction, BtnListMode } from './btn'
-import scoreinfo from './scoreinfo'
+import { ScoreInfoInPage } from './scoreinfo'
 import i18n from './i18n'
 
 const main = (): void => {
   const btnList = new BtnList()
-  const filename = scoreinfo.fileName
+  const scoreinfo = new ScoreInfoInPage(document)
+  const { fileName, id } = scoreinfo
 
   let indvPartBtn: HTMLButtonElement | null = null
   const fallback = () => {
@@ -21,12 +22,12 @@ const main = (): void => {
 
   btnList.add({
     name: i18n('DOWNLOAD')('MSCZ'),
-    action: BtnAction.process(downloadMscz),
+    action: BtnAction.process(() => downloadMscz(scoreinfo)),
   })
 
   btnList.add({
     name: i18n('DOWNLOAD')('PDF'),
-    action: BtnAction.process(downloadPDF, fallback, 3 * 60 * 1000 /* 3min */),
+    action: BtnAction.process(() => downloadPDF(scoreinfo), fallback, 3 * 60 * 1000 /* 3min */),
   })
 
   btnList.add({
@@ -34,19 +35,19 @@ const main = (): void => {
     action: BtnAction.mscoreWindow(async (w, score) => {
       const mxl = await score.saveMxl()
       const data = new Blob([mxl])
-      saveAs(data, `${filename}.mxl`)
+      saveAs(data, `${fileName}.mxl`)
       w.close()
     }),
   })
 
   btnList.add({
     name: i18n('DOWNLOAD')('MIDI'),
-    action: BtnAction.download(() => getFileUrl('midi'), fallback, 30 * 1000 /* 30s */),
+    action: BtnAction.download(() => getFileUrl(id, 'midi'), fallback, 30 * 1000 /* 30s */),
   })
 
   btnList.add({
     name: i18n('DOWNLOAD')('MP3'),
-    action: BtnAction.download(() => getFileUrl('mp3'), fallback, 30 * 1000 /* 30s */),
+    action: BtnAction.download(() => getFileUrl(id, 'mp3'), fallback, 30 * 1000 /* 30s */),
   })
 
   indvPartBtn = btnList.add({
@@ -150,7 +151,7 @@ const main = (): void => {
           const partName = checked.alt
 
           const data = new Blob([await d.action(score)])
-          saveAs(data, `${filename} - ${partName}.${d.fileExt}`)
+          saveAs(data, `${fileName} - ${partName}.${d.fileExt}`)
 
           // unlock button
           initBtn()
diff --git a/src/mscz.ts b/src/mscz.ts
index 1f971b3..999cba2 100644
--- a/src/mscz.ts
+++ b/src/mscz.ts
@@ -1,10 +1,10 @@
 
 import { saveAs, assertRes } from './utils'
-import scoreinfo from './scoreinfo'
+import { ScoreInfo } from './scoreinfo'
 
 let msczBufferP: Promise<ArrayBuffer> | undefined
 
-export const fetchMscz = async (): Promise<ArrayBuffer> => {
+export const fetchMscz = async (scoreinfo: ScoreInfo): Promise<ArrayBuffer> => {
   if (!msczBufferP) {
     const url = scoreinfo.msczCidUrl
     msczBufferP = (async (): Promise<ArrayBuffer> => {
@@ -21,8 +21,8 @@ export const fetchMscz = async (): Promise<ArrayBuffer> => {
   return msczBufferP
 }
 
-export const downloadMscz = async (): Promise<void> => {
-  const data = new Blob([await fetchMscz()])
+export const downloadMscz = async (scoreinfo: ScoreInfo): Promise<void> => {
+  const data = new Blob([await fetchMscz(scoreinfo)])
   const filename = scoreinfo.fileName
   saveAs(data, `${filename}.mscz`)
 }
diff --git a/src/pdf.ts b/src/pdf.ts
index ffa7830..56c86d2 100644
--- a/src/pdf.ts
+++ b/src/pdf.ts
@@ -2,7 +2,7 @@
 import { PDFWorkerHelper } from './worker-helper'
 import { getFileUrl } from './file'
 import { saveAs } from './utils'
-import scoreinfo from './scoreinfo'
+import { ScoreInfo } from './scoreinfo'
 
 let pdfBlob: Blob
 
@@ -23,7 +23,7 @@ const _downloadPDF = async (imgURLs: string[], imgType: 'svg' | 'png', name = ''
   saveAs(pdfBlob, `${name}.pdf`)
 }
 
-export const downloadPDF = async (): Promise<void> => {
+export const downloadPDF = async (scoreinfo: ScoreInfo): Promise<void> => {
   const imgType = scoreinfo.sheetImgType
   const pageCount = scoreinfo.pageCount
 
@@ -31,7 +31,7 @@ export const downloadPDF = async (): Promise<void> => {
     if (i === 0) { // The url to the first page is static. We don't need to use API to obtain it.
       return scoreinfo.thumbnailUrl
     } else { // obtain image urls using the API
-      return getFileUrl('img', i)
+      return getFileUrl(scoreinfo.id, 'img', i)
     }
   })
   const sheetImgURLs = await Promise.all(rs)
diff --git a/src/scoreinfo.ts b/src/scoreinfo.ts
index 16c6b48..81a1c65 100644
--- a/src/scoreinfo.ts
+++ b/src/scoreinfo.ts
@@ -58,7 +58,3 @@ export class ScoreInfoInPage extends ScoreInfo {
     return url.split('@')[0]
   }
 }
-
-export const scoreinfo = new ScoreInfoInPage(document)
-
-export default scoreinfo