Composition: Who Knows? (Heinrich, Max)
| Title | Who knows? |
| Alternative title | Quien sabe? |
| Creators | Max Heinrich (composer) and F. J. Waller (librettist) |
| Opus | |
| Instrumentation | voice and piano |
| Number of movements | — |
| Keys | E flat minor |
| Composed | — |
| First published | 1903 |
| Dedication | David Noyes |
| Tempo markings | — |
| Metronome markings | — |
| Time signatures | — |
| Average duration (sec) | — |
| Number of measures | — |
| Composition types | Songs |
| Language | English |
| Period | Romantic |
| View on IMSLP |  |
| Code |  |
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©2025 David P. Anderson