Dúvidas com JSON

Olá, como vcs estão ?

bom, é o seguinte...

tenho um site onde quero exibir algumas imagens que estão no iTunes.

para eu buscar uma imagem eu utilizo esse link que o iTunes disponibiliza:

https://itunes.apple.com/search?term=Justin+Bieber&limit=1

e ele me retorna esse código abaixo:

{
"resultCount":1,
"results": [
{"wrapperType":"track", "kind":"song", "artistId":320569549, "collectionId":1049605561, "trackId":1049605634, "artistName":"Justin Bieber", "collectionName":"Purpose (Deluxe)", "trackName":"Love Yourself", "collectionCensoredName":"Purpose (Deluxe)", "trackCensoredName":"Love Yourself", "artistViewUrl":"https://itunes.apple.com/us/artist/justin-bieber/id320569549?uo=4", "collectionViewUrl":"https://itunes.apple.com/us/album/love-yourself/id1049605561?i=1049605634&uo=4", "trackViewUrl":"https://itunes.apple.com/us/album/love-yourself/id1049605561?i=1049605634&uo=4", "previewUrl":"http://a1268.phobos.apple.com/us/r30/Music69/v4/8d/89/89/8d898987-2771-877f-b06c-27813f13c79f/mzaf_6954744275616470123.plus.aac.p.m4a", "artworkUrl30":"http://is5.mzstatic.com/image/thumb/Music6/v4/0e/38/b4/0e38b405-ae2c-1da4-5959-866f7abb110e/source/30x30bb.jpg", "artworkUrl60":"http://is5.mzstatic.com/image/thumb/Music6/v4/0e/38/b4/0e38b405-ae2c-1da4-5959-866f7abb110e/source/60x60bb.jpg", "artworkUrl100":"http://is5.mzstatic.com/image/thumb/Music6/v4/0e/38/b4/0e38b405-ae2c-1da4-5959-866f7abb110e/source/100x100bb.jpg", "collectionPrice":13.99, "trackPrice":1.29, "releaseDate":"2015-11-13T08:00:00Z", "collectionExplicitness":"notExplicit", "trackExplicitness":"notExplicit", "discCount":1, "discNumber":1, "trackCount":18, "trackNumber":5, "trackTimeMillis":233719, "country":"USA", "currency":"USD", "primaryGenreName":"Pop", "isStreamable":true}]
}

Gostaria de saber como faço pra exibir somente o link do álbum, a case onde fica o link é: artworkUrl100.

espero tenham entendido...

Obrigado desde já!