Inaya Day has also appeared on Broadway notably as understudy to Stephanie Mills as "Dorothy" in The Wiz and stepped into the lead role in Washington, D.C. and St. Louis, Missouri.

Inaya has had extensive experience as a session musician having appeared on tracks by Michael Jackson, Al Green, Sean "Puffy" Combs, MC Lyte, Queen Latifah, Monie Love, Big Daddy Kane and Jonathan Butler.

Day has also written songs for Randy Crawford and Bootsy Collins. Her best known song that she has writing credits is "Gossip Folks", the second single from Missy Elliott's Under Construction album - Day co-wrote the hook and provided backup vocals on the track.

Day was introduced to house music in 1996 when she was asked to do a little demo. She met German producers Boris Dlugosch and Mousse T who produced a dance single "Keep Pushin" which hit #2 on the Billboard dance charts. She then sang chorus for Mousse T's track "Horny", which later gained popularity when additional vocals from the duo Hot 'N' Juicy was added to the song. "Horny" reached #1 on the Billboard dance charts and was a worldwide dance and pop track. The follow up song "Hold Your Head Up High", with Booom!, reached #6 on the Billboard dance charts.

In 2004, she sang on a track by Australian dance producer mrTimothy called "I Am Tha 1". The track credited to Mr Timothy featuring Inaya Day went to the top of dance charts in Australia and reached the top 30 of the pop charts there. She also sang on his next single "Stand By Me" later that year. "Nasty Girl" was first released in Australia, reaching the top 20, and it was then released in the UK in July 2005, and reached #9 there. Later that year, she also guest featured on "The Glamorous Life", a single by T-Funk, an alternate alias of mrTimothy. In June 2007, Inaya released a cover version of the 1988 Big Pig song Breakaway.