Question: "One Perfect Day" is a song written by Phillip Buckle, Paul van Dyk and an Australian opera singer and what?

Context paragraphs:
For an Angel: "For An Angel" is a trance debut track by German DJ Paul van Dyk.  His most famous track, it was initially released in 1994 as a track on "45 RPM" on the MFS record label, which was van Dyk's first studio album.  It was later reworked and re-released in 1998 as "E-Werk Remix" on Deviant Records, a homage to the E-Werk nightclub where van Dyk used to be the resident DJ, the song reached number-one on the UK Dance Chart for several weeks.  Since its release the track has become one of the most influential and greatest trance tracks of all time.  It was voted by "Mixmag" readers as the eighth greatest dance record of all time.

Paul van Dyk: Matthias Paul (] ), better known by his stage name Paul van Dyk (] ; born 16 December 1971 in Eisenhüttenstadt, East Germany) is a German Grammy Award-winning DJ, record producer and musician.  One of the first true superstar DJs, van Dyk was the first artist to receive a Grammy Award nomination in the newly added category of Best Dance/Electronic album for his 2003 release "Reflections".  He was named the World's number one DJ in both 2005 and 2006, something only few DJs have ever achieved.  He was the first ever DJ to be named number one by "Mixmag" in 2005.  By 2008, he had sold over 3 million albums worldwide.

One Perfect Day (Lydia Denker song): "One Perfect Day" is a song written by Phillip Buckle, David Hobson, and Paul van Dyk and recorded by Australian singer Lydia Denker as the theme to the 2004 film "One Perfect Day" (2004).  Produced by Sam Melamed, the song is a pop rock love song.  It was released as a CD single and maxi single on 16 February 2004 (see 2004 in music) and was the only song released from the soundtrack.

David Hobson (tenor): David Hobson (born 18 November 1960) is an Australian opera singer and composer.

The Other Side (Paul van Dyk song): "The Other Side" is a single released on Paul van Dyk's second DJ mix album "The Politics of Dancing 2".  Paul van Dyk wrote the song in retort to the devastating tsunami which hit southeast Asia on 26 December 2004.  Van Dyk believes it is important to recognise that many thousands of people were affected by this tragedy, and lost loved ones.  "The Other Side" portrays the feeling of still being with a person, in one's thoughts, who has died.  It expresses the faith and aspiration of seeing that person again on "the other side".

In Between (Paul van Dyk album): In Between is the fifth studio album by Paul van Dyk released on 14 August 2007.  The album features a wide range of collaborations including David Byrne of Talking Heads, Jessica Sutta of the Pussycat Dolls, Ashley Tomberlin of Luminary, Alex M.O.R.P.H., Lo-Fi Sugar, Rea Garvey of Reamonn, Ryan Merchant and Wayne Jackson.  The latter had collaborated earlier with Paul van Dyk on the song "The Other Side".  The album also features a vocal sample of Ben Lost from Probspot's "Blows My Mind" on the song "Another Sunday".

Seven Ways: Seven Ways is a trance album by Paul van Dyk released on MFS in 1996 and later on Deviant Records and Mute Records.  It is Paul van Dyk's second studio album.  Several editions include a bonus disc featuring remixes of tracks from the main disc, as well as bonus tracks.

The Politics of Dancing (Paul van Dyk album): The Politics of Dancing is a compilation mix album of trance music, mixed by Paul van Dyk and released by Ministry of Sound and its Australian subsidiary in October, 2001.  It was van Dyk's first released mix album, and was followed by "The Politics of Dancing 2" in 2005.

Perfect Day: Perfect Day or A Perfect Day or One Perfect Day or This Perfect Day may refer to:

Out There and Back: Out There and Back is the third studio album by Paul van Dyk.  It was released in 2000 and is the first album released on his own Vandit record label.  It can be seen as Paul van Dyk's breakthrough album.  Several editions include a bonus CD.

Supporting paragraphs: One Perfect Day (Lydia Denker song) David Hobson (tenor)
Answer: composer