Well, not really crying, but these songs really make me teary (even more so when I watch the vid):
Anata ga ite kureta kara - 'nuff said
Sakura no ki ni narou - It's all Acchan's fault, really. Her last solo lines near the end of song sounds like she's about to cry, and in turn it gets me teary-eyed as well.
Sakura no hanabiratachi - Another sakura song...
Nakeru basho - This was originally just an ok song imo, but then I saw the Shibuya-AX 2011 perf and yeah... Sayaka, Mochi, Yuttan and the rest of the girls make this really an outstanding song. One of my most favorite AKB perf. The bridge part is amazing.
Gondola lift - This one is just plain awesome. That instrumental part before the last chorus is
Beautiful song, and an even more beautiful PV.
Sougen no kiseki - It's all fun and upbeat when Sayaka starts with the chorus followed by the first verse. But then Yuttan, Tomo~mi, Kana and Yuko step in to sing the refrain, and suddenly it becomes so emotional. After that they do the unit breakdown... Gah, I just love the old Team K!
Kareha no station - Rena's tearful rendition of this heartbreaking song at the 2010 SKE Request Hour was so raw, so emotionally-charged. A beautiful, cathartic moment for her.