I really like this songbook... It has a really broad range of songs, for different kinds of moods... Some are fun, some are deep, some are passionate... there's a little something for most moods, so I really enjoy playing songs from this book...
The songs also come with lyrics, in case you feel like torturing people your ocarina is not sufficient... You may also use your "singing" voice... :)
The lyrics are provided together with the ocarina tabs...
Also, there are some duets here, both in the key of C... In case you have a lackey who wouldn't mind providing a a background rhythm... For some songs, this may also allow you to see which tonal range you prefer, as some songs may be played in the lower or the upper range...
I think for 6 of the songs on this book, the videos of Vera or someone else playing on Rotter's (the publisher) youtube's channel, in case you'd like to check out how they are supposed to song...
All in all, I would really recommend this book... I really enjoy playing songs from this book... And I hope you will too... :)