Fiddlestix said
I thought it sounded rather good to me. The rest of the orchestra kinda played a bit loud though.

That was Mozart's symphony #40, how many did the dude write ?   

From Wiki:

Mozart wrote not just the 41 symphonies reported in traditional editions, but up to 68 complete works of this type. However, by convention, the original numbering has been retained, and so his last symphony is still known as "No. 41". Some of the symphonies (K. 297, 385, 550) were revised by the author after their first versions.

Childhood symphonies (1764–1771)

These are the numbered symphonies from Mozart's early childhood.

• Symphony No. 1 in E-flat major, K. 16
• Symphony No. 2 in B-flat major, K. 17 (spurious, attributed to Leopold Mozart)
• Symphony No. 3 in E-flat major, K. 18 (spurious, by Carl Friedrich Abel)
• Symphony No. 4 in D major, K. 19
• Symphony No. 5 in B-flat major, K. 22
• Symphony No. 6 in F major, K. 43
• Symphony No. 7 in D major, K. 45
• Symphony No. 8 in D major, K. 48
• Symphony No. 9 in C major, K. 73/75a
• Symphony No. 10 in G major, K. 74
• Symphony No. 11 in D major, K. 84/73q
• Symphony No. 12 in G major, K. 110/75b
• Symphony No. 13 in F major, K. 112

There are also several "unnumbered" symphonies from this time period. Many of them were given numbers past 41 (but not in chronological order) in an older collection of Mozart's works (Mozart-Werke, 1877-1910, referred to as "GA"), but newer collections refer to them only by their entries in the Köchel catalogue. Many of these can not be completely established as being written by Mozart (see here).

• Symphony in F major, K. 75 (GA 42)
• Symphony in F major, K. 76/42a (GA 43: doubtful)
• Symphony in D major, K. 81/73l (GA 44: doubtful)
• Symphony in D major, K. 95/73n (GA 45)
• Symphony in C major, K. 96/111b (GA 46)
• Symphony in D major, K. 97/73m (GA 47)
• Symphony in F major, K. 98/Anh.C 11.04 (doubtful)
• Symphony in B-flat major, K. Anh. 214/45b (GA 55: doubtful)
• Symphony in B-flat major, K. Anh. 216/74g/Anh.C 11.03 (GA 54: doubtful)
• Symphony in G major, "Old Lambach", K. Anh. 221/45a ("No. 7a")
• Symphony in F major, K. Anh. 223/19a
• Symphony in A minor, "Odense", K. Anh. 220/16a (doubtful)

Salzburg-era symphonies (1771–1777)

These symphonies are sometimes subcategorized as "Early" (1771–1773) and "Late" (1773–1777), and sometimes subcategorized as "Germanic" (with minuet) or "Italian" (without minuet). None of these were printed during Mozart's lifetime.

Although not counted as "symphonies" the three Divertimenti K. 136–138, in 3-movement Italian overture style, are sometimes indicated as "Salzburg Symphonies" too.

• Symphony No. 14 in A major, K. 114 (1771)
• Symphony No. 15 in G major, K. 124 (1772)
• Symphony No. 16 in C major, K. 128 (1772)
• Symphony No. 17 in G major, K. 129 (1772)
• Symphony No. 18 in F major, K. 130 (1772)
• Symphony No. 19 in E-flat major, K. 132 (1772)
• Symphony No. 20 in D major, K. 133 (1772)
• Symphony No. 21 in A major, K. 134 (1772)
• Symphony No. 22 in C major, K. 162 (1773)
• Symphony No. 23 in D major, K. 181/162b (1773)
• Symphony No. 24 in B-flat major, K. 182/173dA (1773)
• Symphony No. 25 in G minor, K. 183/173dB (1773)
• Symphony No. 26 in E-flat major, K. 184/161a (1773)
• Symphony No. 27 in G major, K. 199/161b (1773)
• Symphony No. 28 in C major, K. 200/189k (1774)
• Symphony No. 29 in A major, K. 201/186a (1774)
• Symphony No. 30 in D major, K. 202/186b (1774)

There are also several "unnumbered" symphonies from this time period that make use of music from Mozart's operas from the same time period. They are also given numbers past 41.

• Symphony in D major, K. 111+(120/111a) ("No. 48")
• Symphony in D major, K. (126+(161/163))/141a ("No. 50")
• Symphony in D major, K. 196+(121/207a) ("No. 51")
• Symphony in C major, K. 208+(102/213c) ("No. 52")
• Symphony in D major, K. 135+61h

There are also three symphonies from this time period that are based on three of Mozart's serenades:

• Symphony in D major, K. 204 (based on the Serenade No. 5)
• Symphony in D major, K. 250 (based on the "Haffner" serenade)
• Symphony in D major, K. 320 (based on the "Posthorn" serenade)

Late symphonies (1778–1791)

• Symphony No. 31 in D major, "Paris", K. 297/300a (1778)
• Symphony No. 32 in G major, "Overture in the Italian style", K. 318 (1779)
• Symphony No. 33 in B-flat major, K. 319 (1779)
• Symphony No. 34 in C major, K. 338 (1780)
• Symphony No. 35 in D major, "Haffner", K. 385 (1782)
• Symphony No. 36 in C major, "Linz", K. 425 (1783)
• Symphony No. 37in G major, K. 444 (1783)

  For years this was categorized as a Mozart symphony, but later scholarship determined that it was actually composed by Michael Haydn (Symphony No. 25), and Mozart wrote only the slow introduction for it.

• Symphony No. 38 in D major, "Prague", K. 504 (1786)

The three final symphonies (Nos. 39–41) were completed in about three months in 1788. It is quite likely that he hoped to publish these three works together as a single opus, although actually they remained unpublished until after his death. One or two of them might have been played in public in Leipzig in 1789.

• Symphony No. 39 in E-flat major, K. 543 (1788)
• Symphony No. 40 in G minor, K. 550 (1788)
• Symphony No. 41 in C major, "Jupiter", K. 551 (1788)