"Dream On" is a power ballad by Aerosmith from their 1973 debut album, Aerosmith. Written by lead singer Steven Tyler, this song was their first major hit and became a classic rock radio staple. Released in June 1973, it peaked at number 59 on the Billboard Hot 100 but hit big in the band's native Boston, where it was the number one single of the year on WBZ-FM, number five for the year on WRKO and number 16 on WMEX (AM). The song received immediate heavy airplay too on the former WVBF (FM), often showing up in the # 1 position on "The Top Five At Five" in June 1973.

Answer this question based on the passage: who sang lead on dream on by aerosmith? Let's have some stream of consciousness first.
The important part for answering this question is: Written by lead singer Steven Tyler, this song was their first major hit and became a classic rock radio staple. So, the answer is Steven Tyler.