Easy Ukulele Songs Student Book (C) includes the music and CD for all the songs in the teacher's guide. C Tuning is the standard tuning for ukulele. If students find music online or buy ukulele books at a music store that they want to play along with, it will be in C tuning. If you want to add Orff instruments or recorder to your ukulele performance, C tuning will be the easiest. For those teachers that prefer to use the D tuning, these resources are also available in D tuning.