ITT: Pick your favorites

Any group song may not limited by gen, btw. Any grouping will do.

>Individual Original Song
https://www.youtube.com/watch?v=eM3QQXzOzVE

Till the End of Me (IRyS)

>Group Original Song
https://www.youtube.com/watch?v=Ix_uXN_ybxc

Shunkan Heartbeat (Regloss)

>Individual Cover Song
https://www.youtube.com/watch?v=NuxUU0RO4nY

Hot Limit (Sora)

>Group Cover Song
https://www.youtube.com/watch?v=p1lfwyWSGV4

空奏列車 (StartEnd)

Any other category? Go for it.