---title: "Data Dictionary"---# Unified Music Dataset {.unnumbered}The `unified_music` dataset contains 1,792 songs with variables from three sources: Billboard chart data, Spotify audio features, and Genius metadata.## Loading the Data```rlibrary(coursepackR)data(unified_music)```## Variables### Identification| Variable | Type | Description ||----------|------|-------------||`Song`| character | Song title ||`Artist`| character | Artist name ||`track_id`| character | Spotify track identifier ||`track_album_id`| character | Spotify album identifier ||`track_album_name`| character | Album title ||`track_album_release_date`| character | Album release date |### Billboard Chart Performance| Variable | Type | Description ||----------|------|-------------||`Max_Rank`| integer | Highest chart position achieved (1 = top) ||`Average_Rank`| numeric | Average chart position ||`First_Week_on_Board`| character | Date of first chart appearance ||`First_Rank_on_Board`| integer | Chart position on first appearance ||`Last_Week_on_Board`| character | Date of last chart appearance ||`Last_Rank_on_Board`| integer | Chart position on last appearance ||`Weeks_on_Board`| integer | Total weeks on the chart |### Spotify Audio Features| Variable | Type | Range | Description ||----------|------|-------|-------------||`danceability`| numeric | 0–1 | How suitable for dancing (tempo, rhythm stability, beat strength) ||`energy`| numeric | 0–1 | Perceptual measure of intensity and activity ||`valence`| numeric | 0–1 | Musical positivity (high = happy/cheerful, low = sad/angry) ||`tempo`| numeric | BPM | Estimated tempo in beats per minute ||`loudness`| numeric | dB | Overall loudness in decibels ||`speechiness`| numeric | 0–1 | Presence of spoken words ||`acousticness`| numeric | 0–1 | Confidence that the track is acoustic ||`instrumentalness`| numeric | 0–1 | Predicts whether a track contains no vocals ||`liveness`| numeric | 0–1 | Detects presence of an audience ||`duration_ms`| integer | ms | Track duration in milliseconds ||`key`| integer | 0–11 | Musical key (0 = C, 1 = C#, etc.) ||`mode`| integer | 0–1 | Modality (0 = minor, 1 = major) ||`track_popularity`| integer | 0–100 | Spotify popularity score |### Genre Classification| Variable | Type | Description ||----------|------|-------------||`playlist_name`| character | Source Spotify playlist ||`playlist_id`| character | Spotify playlist identifier ||`playlist_genre`| character | Genre category ||`playlist_subgenre`| character | Subgenre category |### Other| Variable | Type | Description ||----------|------|-------------||`year`| integer | Release year |