On question of spelling: TienAnMen was much used in Beijing at the time, in e.g. The China Daily, English language newspaper published there and given free to visiting English-speaking faculty members of the universities. My wife was Senior Lecturer in English at Beijing Language University for whole of that academic year, and was involved in the June events, having to flee under gunfire and spending night in Beijing Toronto Hotel on way to airport ~~ there were bullet-holes in wall next morning! I had recently returned from a term as British Council Lecturer in English Folksong in universities in Beijing and Guilin, just as it was all starting: as my taxi drove off campus for my flight home, the sound of students on their first demo reached our ears behind us.

Know nothing of song, I fear, so hope this not entirely drift; but the question of spelling seemed worth contributing to, together with my qualifications for doing so. Those internal caps probably a bit pedantic, so I would opt for Tienanmen as probably most acceptable Pinyin rendering.

~Michael~