You can use
=regex([lyrics],/#(.+?)<span#/,1)
I copied that expression to a new expression field and I could not get it to work. I tried a couple of adjustments but REGEX has always been a challenge for me.
There is always a space after <span and I tried /s but could not get it to work.
Here is a typical section of good Lyrics and then <span "Junk"
Well, you tell me men don't have much intuition
Is that what you really thinking girl
Or are you wishing
Before you wreck your old home
And search for another new
Dadgummit
Who is he, and what is he to you
Dadgummit
Who is he, and what is he to you
Dadgummit
Who is he, and what is he to you
Dadgummit
Who is he, and what is he to you
<span jsname="Bil8Ae" class="xTFaxe z1asCe SaPW2b" style="height:18px;line-height:18px;width:18px"><svg focusable="false" xmlns="
http://www.w3.org/2000/svg" viewbox="0 0 24 24"><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"></path></svg>
<span jsname="Bil8Ae" class="xTFaxe z1asCe SaPW2b" style="height:18px;line-height:18px;width:18px"><svg focusable="false" xmlns="
http://www.w3.org/2000/svg" viewbox="0 0 24 24"><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"></path></svg>
<span jsname="Bil8Ae" class="xTFaxe z1asCe SaPW2b" style="height:18px;line-height:18px;width:18px"><svg focusable="false" xmlns="
http://www.w3.org/2000/svg" viewbox="0 0 24 24"><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"></path></svg>
<span jsname="Bil8Ae" class="xTFaxe z1asCe SaPW2b" style="height:18px;line-height:18px;width:18px"><svg focusable="false" xmlns="
http://www.w3.org/2000/svg" viewbox="0 0 24 24"><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"></path></svg>
<span jsname="Bil8Ae" class="xTFaxe z1asCe SaPW2b" style="height:18px;line-height:18px;width:18px"><svg focusable="false" xmlns="
http://www.w3.org/2000/svg" viewbox="0 0 24 24"><path d="M12 8c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z"></path></svg>