cast and pointer to an object syntax in c++

I have the following call for the function Read(void *lpBuf, UINT nCount) and I was confused about the syntax it is being called in from another function, which tries to read a buffer of typeByte

Definition of function:

UINT CFileWave::Read(void *lpBuf, UINT nCount)
{
    return m_File.Read(lpBuf, nCount);
}

Declaration of function within another function:

#define SIZE_PAGE           528l

RiffWav m_sWave;
CWav* pParent;
typedef unsigned char       BYTE;
WavFile.Read((BYTE*)&(pParent->m_sWave), SIZE_PAGE);

RiffWav is a type-def header which contains info on a wav file and CWav is a class that preforms all the work to set the variables inside the Riff Wav header.

My question is what does (BYTE*)&(pParent->m_sWave) pass into the function Read()