Note (Yoshi Topsy-Turvy)
From the Super Mario Wiki
Notes are objects that appear in Yoshi Topsy-Turvy. They appear as small musical notes that show up whenever Yoshi rolls a Chime Ball over a Chime Note and causes it to play a piece of music. These notes can be used as platforms to get to higher places. They come in yellow, blue, and red colors and can appear as either rightside up or upside down eighth notes.