The singer, who, like many other stars, is practising social distancing during the coronavirus chaos, invited followers into his home studio on Tuesday, March 17 by going live on Instagram as he recorded vocals for his latest track, "Open Door".
After sharing his creative process, he offered to text an MP3 file of the demo to anyone interested in hearing the work-in-progress, and shared the lyrics to the song's chorus online.
Shinoda then went one step further, by offering one lucky fan the chance to feature on the tune itself.
"I have an idea," he posted. "I want another voice on the chorus of 'Open Door.' Maybe it can be one of yours? Get the song, sing it, post a link on Twitter with the hashtag #SingOpenDoor and if I love something I'll let you know."
He has since been inundated with verses from aspiring musicians, and has reposted a number of video clips online, while also encouraging others to get involved.
"Keep posting your #SingOpenDoor clips," he tweeted on Wednesday. "There are so many good ones already!"