The renowned musical partnership between siblings Billie Eilish and FINNEAS O’Connell reached a new peak of critical acclaim and fan devotion with their intimate acoustic rendition of the pop hit “Birds of a Feather.” This stripped-down performance, which became a viral sensation, showcased the raw power of their songwriting and FINNEAS’s talent for musical arrangement, making the song feel, as one fan noted, “a whole different song.”
Data Points: The Viral Performance and Chart Success
The viral moment was captured during an Apple Music Artist of the Year showcase in late 2024 (uploaded to YouTube on December 18, 2024). Despite Eilish recovering from illness, the minimalist approach allowed their essential artistry to shine:
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Arrangement: The original synth-pop hit was stripped down to just FINNEAS’s acoustic guitar and their signature dual harmonies.
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Viral Metrics: The performance quickly amassed 2.7 million views on YouTube, prompting massive fan praise for Eilish’s effortless vocals and FINNEAS’s creative transformation of the track.
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Commercial Success: The original studio track, co-written and produced by the siblings for Eilish’s 2024 album, Hit Me Hard and Soft, achieved significant commercial impact:
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It peaked at Number two on the Billboard Hot 100 chart.
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It reached Number one on the Billboard Global 200 chart.
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It was also named Spotify’s most-streamed song of 2024.
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Accolades and Vocal Triumphs
The song was a major focus of the 67th Annual Grammy Awards in 2025, demonstrating the recording industry’s recognition of its excellence:
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Grammy Nominations: “Birds of a Feather” received nominations for Song of the Year, Record of the Year, and Best Pop Solo Performance.
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Vocal Milestone: The song features a key moment of vocal evolution for Eilish: an ad-libbed belt of “’Til the day that I die,” which she has confirmed represents the highest note she has ever hit in her recorded career.
Related Notable Event: Maintaining Momentum
The duo continued to highlight their exquisite acoustic synergy in March 2025 at the iHeartRadio Music Awards, where they opened the ceremony.
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Performance: They delivered a brooding and ethereal take on another album track, “Wildflower,” once again focusing on their pristine vocal interplay, particularly during the song’s emotional bridge.
Through both the intimate Apple Music session and the major awards show appearances, Billie Eilish and FINNEAS have consistently proven their mastery over both innovative production and raw, stripped-down performance.