If you’ve never heard the John Wilson Orchestra, it’s time to experience pure happiness. Buy their 2016 live album Gershwin in Hollywood — seriously, just do it. Play the first track: a medley arranged by Ray Heindorf for Warner Brothers’ 1945 Gershwin biopic Rhapsody in Blue. One by one the great melodies glide past and you’ll already know them, of course: ‘Swanee’, ‘Embraceable You’, ‘I Got Rhythm’.