《天地无限》
原因是根据网上资料和观看该节目的经历，可以确认凤舞九天第五开场的歌曲名叫《天地无限》。
该歌曲是该节目的开场曲，通常与舞蹈组合的华丽表演一起呈现，展现出浩瀚宇宙和舞者的刚柔相济、肆意舞蹈。
除了在该节目中演唱外，该曲目还经常作为舞蹈比赛、晚会等应用，受到广泛欢迎。
因此，该曲目对于凤舞九天这一舞蹈比赛节目来说具有特殊重要性，也成为了该节目的代表曲目之一。
歌名：Dance now － Brothers 歌词：Come on lady
show me baby things I have to know,
don't you know I will blow if you let me go,
are you ready?
if you're ready
show me what to do,
I want you, you me too, we will make it true.
Come on baby, hit now baby
time for us to go,
let me in
don't missing
we will start to flow,
can you feel it like I feel it
do it up and down,
wait a sec
what I feel
now there is no throughout
Come on let's dance now,
moving on the floor,
let's have the power,
stand in , you'll hit the door
bringin all down on us
would you dance some more
stays like all world
let's flow onto our shore
music
Come on lady
show me baby things I have to know,
don't you know I will blow if you let me go,
are you ready?
if you're ready
show me what to do,
I want you, you me too, we will make it true.
Come on baby, hit now baby
time for us to go,
let me in
don't missing
we will start to flow,
can you feel it like I feel it
do it up and down,
wait a sec
what I feel
now there is no throughout
Come on let's dance now,
moving on the floor,
let's have the power,
stand in , you'll hit the door
bringin all down on us
would you dance some more
stays like all world
let's flow onto our shore
music
