input: With professionalism far from foremost concern, The Aquabats' earliest band line-ups changed with almost every concert, occasionally featuring as many as twelve to fourteen musicians at a time onstage, with the majority typically playing brass instruments. As they gradually developed a steady following and began playing shows with more regularity, the band settled into a tighter and more manageable unit consisting of around eight to nine musicians, filled out by a horn section, two guitarists and a keyboardist. It was with this type of line-up that The Aquabats began recording, independently producing the demo tapes The Revenge of the Midget Punchers in 1994 and Bat Boy in 1995. Initially, The Aquabats intended to make each of their performances unique by wearing a different set of matching costumes for every concert, ranging from chef's uniforms to grass skirts and fezzes, all with an individual persona -- during one show wearing chef outfits, for instance, the band hosted an actual onstage barbecue. When the group's props and get-ups soon became more cumbersome to transport than their musical equipment, it was ultimately decided a singular costume was required. Terry, a future apparel designer who was employed by the wetsuit manufacturing company Aleeda at the time, acquired a large amount of spare rubber and neoprene and fashioned together a set of helmets and rashguards for the band members. The addition of customized vinyl belts, donated to the band by then-unknown artist Paul Frank, effectively completed the style The Aquabats would maintain for the rest of their career. To accompany their distinct new uniforms, The Aquabats constructed a backstory which alleged they were actually superheroes hailing from the distant island of "Aquabania", though Larson admits the entire mythology was simply made up piece by piece as they went along from one interviewer to the next. As their mythology grew, the members soon adopted superhero stage names and identities, and began tailoring their live shows around a comic book aesthetic by incorporating onstage stunts and mock battles with costumed villains, antics which were originally ploys to get the band's friends into shows for free. Jacobs' brothers Parker and Tyler, a cartoonist and graphic artist, respectively, were brought in to help develop the band's cartoon-influenced visual style, designing their logos and promotional material as well as playing characters in The Aquabats' stage shows and mythology. In 1995, The Aquabats independently produced and recorded their debut album, The Return of The Aquabats, pressing the CDs themselves. Having already amassed a sizable cult following for their increasingly eccentric live shows, the band managed to sell a respectable 20,000 copies of their album without any marketing or distribution. With the growing mainstream popularity of ska music, The Aquabats quickly rose to prominence within Orange County's booming ska scene, regularly touring alongside the likes of such commercially successful bands as No Doubt, Sublime and Reel Big Fish and bringing them to the brink of achieving mainstream recognition. In early 1996, the Aquabats first drummer, Rod Arellano was forced to quit due to touring schedule conflicts and was replaced by a young 20 year-old named Travis Barker. Travis played his first show as the Baron Von Tito opening up for Fishbone at the Glass House in Pomona.

Answer this question "Did they release any albums?"
output: the band managed to sell a respectable 20,000 copies of their album without any marketing or distribution.

Question: Mayday (Chinese: Wu Yue Tian ; pinyin: Wu Yue Tian; Peh-oe-ji: Go[?]-goeh-thin), is a Taiwanese band that was formed in the late 1990s with five members, Monster (leader, lead guitar), Ashin (vocal), Stone (rhythm guitar), Masa (bass) and Guan You (drums). Formerly So Band, they came to be known as Mayday in 1997, with the name originating from Masa's online nickname. Mayday won the Golden Melody Award for Best Musical Group in 2001, 2004, 2009 and 2012.. CNN calls them "The Chinese Beatles" and they are named "Kings of concerts" in Asia.

During their hiatus, Mayday released the autobiographical documentary titled The Wings of Dream <<Yao Gun Ben Shi >> , with ticket sales hitting more than NT1.2 million in barely three days. They also released an accompanying soundtrack. After Masa's official release from the military, the band regrouped and made a return to the music industry. To mark the event, Mayday held their City of the Sky <<Tian Kong Zhi Cheng >> concert on 16 August 2004 at the Taipei Municipal Stadium. The concert attracted nearly 40,000 fans, which broke the record for the most concert-goers in Taiwan, a record previously held by Michael Jackson. On 11 November 2003, the band also released their 4th studio album Time Machine <<Shi Guang Ji >> . Sales of the album hit more than 15,000 within two days, with Mayday seeing no decline in their popularity despite their hiatus. Time Machine also won Mayday their second Best Musical Group award at the 15th Golden Melody Awards. In the summer of 2004, Mayday also participated in the making of the soundtrack for the movie Love of May, in which they also presented new arrangements of some of their old songs. Stone also had a supporting role in the movie. 5 November 2004 saw the release of their critically acclaimed 5th studio album God's Children Are All Dancing/Flying Angels With A Falling Soul <<Shen De Hai Zi Du Zai Tiao Wu >> . This album used the simultaneous recording technique to create the distinctive "band" sound of their past albums and was specially recorded at Lake Kawaguchi, Japan. In 2005, they also released a best of compilation album Just My Pride <<Zhi Zu Zui Zhen Jie Zuo Xuan >> , which included six new songs and favourites culled from previous albums.

Using a quote from the above article, answer the following question: What happened with the return to the music scene in 2004?
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Answer:
To mark the event, Mayday held their City of the Sky <<Tian Kong Zhi Cheng >> concert on 16 August 2004 at the Taipei Municipal Stadium.