Emote (or emotion) commands show facsimiles of facial expressions or representation of other emotions.
Given the emotional nature of emotes, the meaning may differ to individuals. Keep this in mind if you get offended by an emote. The possibility exists that offense was unintended. Also, using more ambiguous emotes should be done with this consideration and caution may be in order.
/smilies or /emoticons gives the following in game instructions:
/sing is an anomaly. It only works at a table and /help sing doesnt work. /sing counts as 2 emotes for the 6 emote limit.
/sing :music :music (text) :music :music is an extremely limited shortcut for the 6 emote limit.
Being an text action, /sing&&/sing (text) doesn't work.