I had a dab of classical Tibetan, and spoken Tibetan. Mostly European languages: Russian, Spanish, French, Norwegian, Serbo-Croatian, German (rusty on the last 3). Mandarin, but I always forget the script soon after I learn it. I'm not visual, I'm aural, and learn through my ears. Mandarin's good with Tibetan, though. I notice a lot of Chinese words and phrases in Tibetan. The Tibetan grammar, though, comes from the Altaic languages, so some background in Turkic or Mongol can be helpful there. The Sinitic/Altaic split in Tibetan language is fascinating, similar to the Nomad (Altaic) and sedentary (Sinitic) divide in the people themselves.