Question: Are Doug Fieger and Ian Curtis both lead singers?

Context articles: Normal as the Next Guy
...But the Little Girls Understand
Doug Fieger
Can't Put a Price on Love
Good Girls Don't (song)
(She's So) Selfish
Ian Curtis
Sky (US band)
My Sharona
Baby Talks Dirty

Normal as the Next Guy is the 6th and final album released by The Knack in 2001.
 It marks the 4th comeback attempt by the band after its second album, "...But the Little Girls Understand", failed to achieve the success of the band's début album.
 Allmusic critic Mark Deming noted that the album finds songwriter and lead singer Doug Fieger having resolved his issues with women, but has not "found a subject that appears to compel him nearly as much as the treacheries of girls once did."
 Therefore, Deming feels that compared to older songs by the band, the songs on "Normal as the Next Guy" "may be more pleasant, but they're not as interesting."
 The "Rolling Stone Album Guide" gave the album a 3 star rating, as high as the group's début "Get The Knack", and higher than any other Knack studio album.
...But the Little Girls Understand is an album by power pop/new wave group The Knack released by Capitol Records in February 1980.
 The album reached the number 15 spot on the "Billboard" 200 album chart in 1980.
 The singles "Baby Talks Dirty" and "Can't Put a Price on Love" both charted on the "Billboard" Hot 100 at #38 and #62, respectively.
 The song "Mr. Handleman" was released as a single in some countries, such as New Zealand.
 Guitarist Berton Averre has stated that "Mr. Handleman" was the first song he and lead singer Doug Fieger wrote together.
 The RIAA certified the album as Gold on April 14, 1980.
Douglas Lars "Doug" Fieger (August 20, 1952 – February 14, 2010) was an American singer-songwriter-musician.
 He was the rhythm guitarist and lead vocalist of the rock band The Knack, and co-wrote "My Sharona", the biggest hit song of 1979 in the USA, with lead guitarist Berton Averre.
"Can't Put a Price on Love" is a 1980 song written by Doug Fieger and Berton Averre.
 It was originally released by American pop group The Knack on their second album, "...But the Little Girls Understand".
 It was the second song from that album that was released as a single, reaching #62 on the "Billboard" Hot 100, falling short of the performance by its preceding single, "Baby Talks Dirty", which reached #30 in Cash Box and #38 in "Billboard".
 Overall, it was the fourth single which The Knack had released, and was the first such release which did not reach the Top 40.
"Good Girls Don't" is a 1979 hit single written by Doug Fieger and released by the rock band The Knack, off their album "Get the Knack."
 It was the follow-up to the group's number-one hit single, "My Sharona".
 "Good Girls Don't" was a No. 1 single in Canada.
 It reached No. 11 on the "Billboard" Hot 100 chart and No. 66 on the British charts.
 It also reached No. 20 in New Zealand.
 The song has since been covered by a number of artists, including The Chipmunks, Ben Folds, The Chubbies, and The McRackins.
"(She's So) Selfish" is a hit song written by Doug Fieger and Berton Averre that was first released by the Knack on their #1 debut album "Get the Knack" in 1979.
 It also appeared on a number of live and compilation albums.
 It was intended for release as a single, but was prevented by its "scatological" lyrics.
 It was inspired by the same woman who inspired the band's #1 single "My Sharona."
 It was praised by critics for its hooks and style, but criticized for its nastiness and sexism.
Ian Kevin Curtis (15 July 1956 – 18 May 1980) was an English singer-songwriter and musician.
 He is best known as the lead singer and lyricist of the post-punk band Joy Division.
 Joy Division released their debut album, "Unknown Pleasures", in 1979 and recorded their follow-up, "Closer", in 1980.
Sky was an American rock power trio active in the early 1970s, based out of Detroit, Michigan.
 It released two albums with RCA before breaking up in 1973.
 It's mostly known today as an early point in musician Doug Fieger's career, later the frontman of The Knack.
"My Sharona" is the debut single by the Knack.
 The song was written by Berton Averre and Doug Fieger, and released in 1979 from their album "Get the Knack".
 It reached number one on the "Billboard" Hot 100 singles chart where it remained for 6 weeks, and was number one on "Billboard"' s 1979 Top Pop Singles year-end chart.
"Baby Talks Dirty" is a 1980 Top 40 single written by Doug Fieger and Berton Averre from the Knack's second album, "...But the Little Girls Understand".
 Like the album it was taken from, "Baby Talks Dirty" fell short of the success of its predecessors.