Вывод в формате JSON, поэтому для его импорта используйте пакет jsonlite:
library(jsonlite)
releasesHM <- fromJSON("https://api.discogs.com/artists/135872/releases")
Вы получите список с данными.
Титулы:
> head(releasesHM$releases$title)
[1] "The Max Roach Quartet Featuring Hank Mobley"
[2] "Mobley's Message"
[3] "Jazz Message #2"
[4] "The Jazz Message Of"
[5] "Base On Balls / Stella-Wise"
[6] "Lower Stratosphere / Reunion"
Исполнители:
> head(releasesHM$releases$artist)
[1] "The Max Roach Quartet* Featuring Hank Mobley"
[2] "Hank Mobley"
[3] "Hank Mobley"
[4] "Donald Byrd, Hank Mobley, Horace Silver, Doug Watkins, John La Porta*, Ronnie Ball, Wendell Marshall, Kenny Clarke"
[5] "Hank Mobley"
[6] "Hank Mobley"