Resources For Learning Scheme?

[melophobic]

Can anyone point me to a good resource or two for learning scheme? I have
looked through the examples on Lilypond.org and a few on lilypondblog.org,
but I am looking for more in depth examples of things like if statements and
more complex use of variables. 

Should I just look up books on Guile? 

Thank you, 

Brian



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