On about Thursday, April 8, 1824, during a two- or three-day period when the undecided Beethoven contemplated giving his concert at the Theater an der Wien on April 22, he wrote the following informal note to the Gesellschaft der Musikfreunde:

“The undersigned herewith most respectfully invites all amateur musicians to support him with their talents at his Akademie, which is to take place on April 22 in the Theater an der Wien. Those who kindly wish to take part are graciously requested to sign this invitation in their own handwriting.

Ludwig van Beethoven”

Sixteen individuals signed Beethoven's request:

• [1] Georg Hellmesberger (1800–1873), already violinist, Karntnertor Theater; Gesellschaft concerts since 1818; professor at the Gesellschaft's Conservatorium, 1821–1848 (Z, 119; Mf )

• [2] Joseph Böhm (1795–1876), violin; Gesellschaft concerts since 1819; professor at the Gesellschaft's Conservatorium; member of Hofkapelle (Z, 118; Mf )

• [3] Karl Holz (1799–1858), violinist in Schuppanzigh's Quartet, wrote “wird erscheinen” (will appear) after his signature. Res: Molkerbastei No. 84 (Bo; Z, 136)

• [4] Maximilian Philipp (Br)

• [5] Anton Röhrich (ca. 1785–September 13, 1832), all strings and horn but specialized on the contrabass; had his own salon; Gesellschaft concerts, violoncellist, Theater an der Wien by 1822; wealthy merchant; member of Scharfschutzen-Corps. Res: Wieden, Neuwiedener Hauptstrasse No. 309, his own house (Bo; Z, 147 and 191; S-V, 162–164; Mf; WZ)

• [6] Karl Fradl, violin, Gesellschaft Board. Res: Mariahilf, Kleine Kirchengasse No. 24 (Bo; Z, 114 and 118)

• [7] Joseph Kaufmann (February 24, 1788–March 25, 1860),3 second violin and viola, Sonnleithner salon; Gesellschaft concerts from 1828/1830; official in Supreme Court. Res: Schottenbastei No. 1167 (Bo; Z, 118, 136, and 193; S-V, 173; Mf; WZ)

• [8] Friedrich Kunst, supporting member, Gesellschaft der Musikfreunde. Res: Stock-im-Eisenplatz No. 876 (Z, 171)

• [9] Leopold Kletzinsky (Br)

• [10] Franz Hacker (Br)

• [11] N. Hacker

• [12] Johann Nepomuk Fischer (b. Vienna, 1774), violin/concertmaster. Res: City, Herrengasse No. 252 (Bo; Z, 118 and 135; Heft 93, Blatt 6r)

• [13] Friedrich Gross, violoncello; chamber music; Gesellschaft concerts from 1824. Res: City, Steindlgasse No. 430 (Bo; Z, 17 and 144; S-V, 173 and 176; Mf)

• [14] Johann Riegler, violin and piano. Res: City, Renngasse, No. 157 (Z, 40)