Birdy

From the very beginning of this video we can see that Birdy was using a Beyerdynamic DT 770 PRO headphone.

At around 45 seconds of this video we can have a closer look at her headphone which was clearly Beyerdynamic DT 250 PRO

In the official live performance video for "Loneliness," Birdy can be seen using Audio-Technica ATH-M40x headphones. This identification is based on distinct features such as the smaller ring of reflective chrome compared to the commonly used ATH-M50x and the absence of posts near the headband /earcup connection, and the presence of a headband characteristic of the ATH-M40x, and other lower cost models. Other lower-cost models from Audio-Technica do not possess the chrome ring, making the ATH-M40x the identifiable model in use by Birdy during this performance. This observation is supported by the video published by Birdy on her YouTube channel, providing visual evidence of the gear in use. More recently Birdy uses a new brand of headphones, and sometimes in ear monitors, and these may no longer be the artists preferred headphones for performance