Q, When do birds sing?
A: When they're set free.
You sang very well Mr. LG.
Welcome to life in the Light.
Yes Anon.
It's tied into Q saying "when do birds sing" when referring to He Who Must Not Be Named.
It was a taunt because the Q team knew that he had LG on a leash, HWMNBN was terminal and the moment he died LG was free to sing.
The deepstate attempted ( and failed) to assassinate LG during a press conference in 2013.
With HWMNBN now dead it's pretty safe to extrapolate that it was he who ordered the hit.