Question: Hanging Gardens collaborations from which artist that performed under  the name "Senior", Jeppe was the lead vocalist of the pop duo Junior Senior?

Context paragraphs:
Say Hello, Wave Goodbye (EP): Say Hello, Wave Goodbye is an EP by Danish pop duo Junior Senior.

D-D-Don't Don't Stop the Beat: D-D-Don't Don't Stop the Beat is the first studio album by Danish pop duo Junior Senior.  Originally released in March 2002 in Denmark, an altered edition became available later in the year for the rest of continental Europe, and in 2003 the album was released in both the UK and US.  It is most widely known for the song "Move Your Feet", the duo's first and most successful single.  The United States release of the album received the Parental Advisory rating on its release.

Hanging Gardens (Classixx album): Hanging Gardens is the debut studio album by Los Angeles-based electronic music production duo Classixx, consisting of Michael David and Tyler Blake.  The duo had been making tracks since 2007 but did not decide to release a full-length album until much later because of their concerns over listeners really wanted an LP from them.  In making the record, Classixx went for a record with "hooky melod[ies]," "some nice chords," and a positive feel-good tone while still having depth not common in dance music.  "Hanging Garden" is an electropop album that contains elements of a wide variety of genres such as French dance music, rock, Chicago house, R&B, techno, and balearic beat.  The LP features collaborations from acts such as Nancy Whang, Active Child, Sarah Chernoff, Jeppe, and Jesse Kivel.

Junior Senior: Junior Senior was a pop duo from Denmark.  The duo consisted of Jesper "Junior" Mortensen (vocals, guitar, bass guitar, drums, percussion, keyboards) (born 7 February 1979) and Jeppe "Senior" Laursen (vocals, guitar, keyboards, programming) (born 25 December 1977).  They were well known for their 2002 single "Move Your Feet", which gained worldwide success in 2003, notably in the UK.

Boy Meets Girl (EP): Boy Meets Girl is an EP by Danish pop duo Junior Senior.  It was released on June 10, 2003 by Crunchy Frog Records.

Shake Your Coconuts: "Shake Your Coconuts" is a song by Danish indie pop duo Junior Senior.  The song was recorded in 2003 as the third single from their debut album "D-D-Don't Don't Stop the Beat".

Hey Hey My My Yo Yo: Hey Hey My My Yo Yo is the second and final album by Danish pop duo Junior Senior, released in Japan and parts of Europe in 2005.  It was released in Australia on April 9, 2007.  The album was not released in the UK, for reasons that have never been made clear.  The album was released on August 14, 2007 in the United States and packaged with a bonus EP.

Move Your Feet: "Move Your Feet" is a song by Danish pop duo Junior Senior.  The song, originally released in June 2002 in the duo's native Denmark, was later released in 2003 worldwide and became Junior Senior's biggest hit, reaching No. 3 in the United Kingdom and No. 20 in Australia.  It features lead vocals by producer Thomas Troelsen.

The Hanging Gardens of Beatenberg: The Hanging Gardens of Beatenberg is the second album by South African indie pop band Beatenberg.  It was produced by the bassist, Ross Dorkin, and was released on 15 August 2014 on their current label, Universal Music Africa.  Thematically, the album captures thoughts of love and light-hearted subjects The Hanging Gardens of Beatenberg was recorded from June 2013 till March 2014 at Sunset Studios in Stellenbosch and, vocalist, Matthew Field's home studio.

Jeppe Laursen: Jeppe Breum Laursen is a Danish singer-songwriter and producer.  Performing under the name "Senior", Jeppe was the lead vocalist of the pop duo Junior Senior.  Dazed and Confused praised Jeppe's music for its "urgency and club appeal" and described it as "industrial synth-pop and bone-rattling drama."  Jeppe is currently working on his debut solo album.  His first solo release was a collaboration with Classixx entitled "I'll Get You" which was released in 2009 on Kitsuné.  Laursen also remixed MEN in 2010.

Supporting paragraphs: Hanging Gardens (Classixx album) Jeppe Laursen
Answer: Jeppe