Alternative can't get enough fun.

fun. -- Nate Ruess, Andrew Dost and Jack Antonoff -- notches its second No. 1 in as many appearances on Billboard's Nielsen BDS-based Alternative radio airplay chart, as "Some Nights," the title cut from its breakthrough album (which has sold 446,000 copies, according to Nielsen SoundScan, and reached No. 3 on the Billboard 200), rises 3-1.

The group first reigned for two weeks in April with its first Alternative entry, "We Are Young," featuring Janelle Monae. (The track also topped the Billboard Hot 100 for six frames.)

Hot 100: Fun. Makes Digital Sales History in Sixth Week at No. 1

How rare is the achievement of topping Alternative twice in a row from the start? Only two acts -- each eventual format cornerstones -- had previously arrived at alternative radio with a pair of out-of-the-gate leaders.

In 1994, Green Day's "Longview" crowned the June 11 chart. "Basket Case" followed with a five-week command beginning Aug. 20, 1994. Green Day now boasts nine career No. 1s and 20 top 10s on Alternative. Its latest single, "Oh Love," jumps 7-5 in its second week on the chart. The track previews Uno! (due Sept. 25), the first of three Green Day albums to be released over a 16-week span. Dos! follows on Nov. 13 and Tres! arrives on Jan. 1.

In 1995, Alanis Morissette likewise broke onto alternative radio with two introductory leading titles. "You Oughta Know" ruled for five weeks beginning that July 22 and "Hand in My Pocket" topped the Oct. 14, 1995, survey. After "All I Really Want" reached No. 14, Morissette added the three-week No. 1 "Ironic" in 1996. The songs were released from the singer/songwriter's album Jagged Little Pill, which, with to-date sales of 14.8 million, ranks as the third-best-selling set in SoundScan's 21-year history; Metallica's Metallica leads with sales of 15.8 million, followed by Shania Twain's Come on Over (15.5 million).

Morissette releases her eighth studio album, Havoc and Bright Lights, Aug. 28.

(Peter Gabriel also sent his first two Alternative entries -- "Digging in the Dirt" and "Steam" -- to No. 1 in 1992, although his career long predated the chart's Sept. 3, 1988, launch.)