Promise Letter
K.P.L
LOST LETTERS
2:12 January 9, 2026
BPM
107
Key
A♭ Major
Camelot
4B

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Promise Letter by K.P.L Song Details

Popularity
35%
Loudness
-12.407 dB
Acousticness
2%
Danceability
61%
Energy
52%
Instrumentalness
0%
Liveness
20%
Loudness
79%
Speechiness
23%
Valence
32%

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Promise Letter is a somber, mid-energy track by K.P.L from LOST LETTERS, released January 9, 2026. It runs 2:12 at 107 BPM (214 BPM double-time) in A♭ Major (Camelot 4B).

Find the BPM and music key for any song with our BPM and Key Finder.

ISRC
NL9KR2603694
Label
L-M Records/RCA Records