"Heaven Knows" is a rock

Rock music

Rock music is a genre of popular music that developed during and after the 1960s, particularly in the United Kingdom and the United States. It has its roots in 1940s and 1950s rock and roll, itself heavily influenced by rhythm and blues and country music...

 song performed by English rock singer Robert Plant

Robert Plant

Robert Anthony Plant, CBE is an English singer and songwriter best known as the vocalist and lyricist of the iconic rock band Led Zeppelin. He has also had a successful solo career...

. It was the first single to be released from his 1988 album Now and Zen

Now and Zen

Now and Zen is an album by the former Led Zeppelin singer Robert Plant, released in 1988 under the label Es Paranza. The album made the top 10 in both the U.S. and the UK, reaching #6 in the former, and #10 in the latter...

. It reached number 33 on the UK singles chart and number 1 on the Billboard

Billboard (magazine)

Billboard is a weekly American magazine devoted to the music industry, and is one of the oldest trade magazines in the world. It maintains several internationally recognized music charts that track the most popular songs and albums in various categories on a weekly basis...

Mainstream Rock chart. It was Plant's third number 1 rock song, following 1983's "Other Arms

Other Arms

"Other Arms" is a rock song performed by English rock singer Robert Plant, the first track from his 1983 album The Principle of Moments. It was Plant's first number-one hit on the Billboard Top Tracks chart.- Details :...

" and 1985's "Little by Little

Little by Little (Robert Plant song)

"Little by Little" is a rock song performed by English rock singer Robert Plant, from his 1985 album Shaken 'n' Stirred. It was released as a single and entered the Billboard Top 40 on June 15, 1985, peaking at number 36...

."

The song was written by keyboardists Phil Johnstone

Phil Johnstone

Phil Johnstone is a songwriter, keyboardist, guitarist and record producer, best known for his work with singer Robert Plant. His songwriting credits include Plant's number-one Mainstream Rock hits "Heaven Knows", "Tall Cool One" and "Hurting Kind ".- Details :Johnstone first worked with Plant on...

 (who also co-produced Now and Zen) and David Barratt

David Barratt

Born in London England Barratt worked in New York and composed music for TV and radio commercials for, amongst others, Michelin, BMW, Coke, LA Gear, Dr Pepper, Revlon, Verizon, Sony, Kodak, 7Up, Pepsi/Star Wars, USA Today, Bridgestone, Hasbro, and H&M....

.