Guild Restricted Skills
The skills found here cannot be learned over rank 36 without being a member of the guild or learning from someone with the ability to teach it to your character.
Blacksmithing, Chandlery, Tailoring, Woodworking, Jeweling, Leatherworking
Steal, Lockpicking, Thieves Cant (tcant)
Knights and Nobility:
Singing, Acting, Woodwind, Strings, Drums, Brass