I start the 2nd grade Melody unit by watching the Sound of Musicclip of Do Re Miand then learning to sing the song. I use the following slides for the PowerPoint. Once we learn the song well (we sing it to open each Melody lesson), we add Curwen hand signs.
Do Re Mi - free piano music here Do Re Mi - buy sheet music here
Then there's the fun song: Ebeneezer Sneezer. We sing it, play it on xylophones and act it out by pointing from the floor, then our knees, then thighs, etc - as we sing up the scale.