Answer by taking a quote from the following article:

Donnie Iris (born Dominic Ierace on February 28, 1943) is an American rock musician known for his work with the Jaggerz and Wild Cherry during the 1970s, and for his solo career beginning in the 1980s with his band, the Cruisers. He wrote the #2 Billboard hit, "The Rapper", with the Jaggerz in 1970 and was a member of Wild Cherry after the group had a #1 hit with "Play That Funky Music." He also achieved fame as a solo artist in the early 1980s with the #29 hit "Ah! Leah!"

Iris' first album, Back on the Streets, was released in July 1980 on the small Cleveland, Ohio-based Midwest Records. With the track "Ah! Leah!" receiving airplay in Boston, Cleveland and Pittsburgh, MCA Records took notice and quickly signed Iris to a five-album deal and re-released the album nationally in October. The first single "Ah! Leah!" peaked at #29 on the Billboard Hot 100 (and #34 in Australia) in February 1981 and became one of the most frequently played AOR tracks of the year, and the album reached #57 on the Billboard 200. In addition, the band launched a national tour to promote the album and its follow-up during the summer of 1981.  The follow-up album, King Cool, credited to Donnie Iris and the Cruisers, was released in August 1981 and garnered the band more AOR success, with "Love Is Like a Rock" reaching #9 on Billboard's Top Tracks chart. Two other songs from the album received significant AOR airplay; "My Girl" at #25 and "Sweet Merilee" at #31, charted on the Rock Tracks chart. In addition, he gained the nickname King Cool from this album in the later part of his career. However, the album itself charted less successfully, at #84. After the long tour promoting their two previous albums, the band continued songwriting and in the fall of 1982 released The High and the Mighty. The album contained the single "Tough World," but only charted at #180, marking a decline in his success, but the band still was determined to release new material.  Their next album one year later, Fortune 410, contained the hit single "Do You Compute?" which was used by their label MCA and the computer company Atari to form a cross-marketing promotion. Because the promotional partnership was secured prior to release of the album, it was possible to use the Atari 1200 XL Home Computer in poster photography, as well as in the video clip for "Do You Compute?", which aired on MTV. The title of the album is a reference to the trademark glasses Iris wears, Fortune 410's. The combination of marketing and the promotion for its hit single allowed the album to chart higher than its predecessor.  Despite Fortune 410 charting higher than The High and the Mighty, MCA was displeased that both albums didn't chart as high as Back on the Streets and King Cool had. The label suggested that the band allow them to bring in a new producer, displacing Mark Avsec, as well bring in new songwriters. Iris and the Cruisers, wanting to keep as much of their creative freedom and sound as they could, said no. As a result, MCA dropped the band in 1984.  Shortly after being let go from MCA, the band signed with the small HME Records label. Their next album, No Muss...No Fuss, released in 1985, continued the trend set by Fortune 410 by charting at #115 with the single "Injured in the Game of Love". Both of the aforementioned albums ended up being more critically acclaimed than The High and the Mighty.

What was Donnie Iris and the Cruisers biggest hit song?
"My Girl" at #25