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2. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). [1] [2] Every octave is made of twelve steps called semitones.

3. Template:Singles discography - Wikipedia

   en.wikipedia.org/wiki/Template:Singles_discography

   chart x (chartA, chartB, ...) – Details for each chart in the table. Include the country code, a link to the relevant chart, and any references for the chart. Only rendered for the number of charts specified by charts. chart x _width – The width of the chart x column. Defaults to 3em, a value of 4.5em is recommended for component charts.

4. Musical note - Wikipedia

   en.wikipedia.org/wiki/Musical_note

   The top note of a musical scale is the bottom note's second harmonic and has double the bottom note's frequency. Because both notes belong to the same pitch class, they are often called by the same name.

5. 9 Free, Easy-To-Use Budget Templates and Spreadsheets - AOL

   www.aol.com/finance/9-free-easy-budget-templates...

   Instead, here are nine completely free, simple-to-use budget templates and spreadsheets that are available to download right now. 1. Microsoft Excel Personal Monthly Budget Spreadsheet

6. Scientific pitch notation - Wikipedia

   en.wikipedia.org/wiki/Scientific_pitch_notation

   For example, C 4 is one note above B 3, and A 5 is one note above G 5. The octave number is tied to the alphabetic character used to describe the pitch, with the division between note letters ‘B’ and ‘C’, thus: "B 3" and all of its possible variants (B, B ♭, B, B ♯, B) would properly be designated as being in octave "3".

7. A440 (pitch standard) - Wikipedia

   en.wikipedia.org/wiki/A440_(pitch_standard)

   A440 (also known as Stuttgart pitch [1]) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A 4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.