Here is a list of virtual instruments, if you are new to producing, there are plenty of free instruments you can use to make beats. Here is a list.
They are all free.
LABS Piano by Spitfire Audio
Key Zone Classic
Upright Piano
Native Instruments Kontakt 8 Piano
Native instruments has a piano in this player
BBC Ochestra by Spitfire Audio
Violins and Violas also by Spitfire Audio
The Free Orchestra
works with Kontakt player
SINE factory Helix
Odin 2
Surge
99 drums samples
Orchestral Tools Crux Bass
Free Producer 