音樂的樂譜前面為什麼會有個"b"字ga呢??[10分]

1. 個"b"係flat, 即係降半音. 估計你係見到五線譜高音譜號果part上面第3條線, B呢個音個位見到呢個"b"字, 咁即係全首歌彈到B呢個音都要flat左佢降半個音. 順帶一提, 樂譜前面你見到有個"#", 就係sharp, 即係升半個音

2. 個do音係邊個位取決於呢首歌係咩major/minor. 譬如話A譜係A major, 個do音當然係A呢粒音啦; B譜係C major, 咁do個音當然唔同, 因為C先係do
點樣認就要睇番呢首歌係咩major喇. 好似你第1題問果個譜咁, B呢個音flat左, 就係以F做do音既F major; 如果無sharp無flat就係C major; sharp左個F就係G major等等. 玩開樂器同學過樂理既人好易睇得出, 呢樣主要靠熟能生巧

3. 2/4, 4/4呢D係指每個小節係由幾多個幾多拍子既音符組成. 2/4係指每個小節係由"2"個"4"分音符組成; 4/4就係每個小節由"4"個"4"分音符組成. 比較常見既有3/8, 4/4, 8/16等等