“Kathleen” emerged as the most commercially successful single from Catfish and the Bottlemen’s debut album, The Balcony. It was notable for being the band’s first song to chart in Japan and the United States. In their native United Kingdom, the track reached number 110 on the UK Singles Chart and number 11 on the UK Independent Singles Chart. In the US, “Kathleen” climbed to number 17 on the Billboard Alternative Songs chart and number 40 on the Hot Rock Songs chart, benefiting from moderate radio airplay. The song also achieved Platinum status in the UK, as certified by the British Phonographic Industry, and reached number 82 on the Japan Hot 100.