Misc: What vitamin deficiency causes rickets?

Questions

This Paul Simon song was the first release from _Rhythm of the Saints_.?

U2 song: "Johnny take a walk with your sister the moon".?

Velvet Underground song about a self-mailing young man??

Vince Guaraldi song which is played in every Charlie Brown animated special.?

What is the name of MTV's VJ Marijne Van Der Vlugt's band??