Исправить ошибку C2079 "MiniPlayer::music" использует неопределенный class "MiniMusic"

#pragma once
#include <string>
#include <vector>
#include <SFML/Audio.hpp>
#include "MiniMusic.h"
 
class MiniMusic;
 
enum Actions {
    AU_PLAY,
    AU_PAUSE,
    AU_STOP,
    AU_NEW_TRACK,
    AU_NEXT,
    AU_PREV
};
 
using FileVector = std::vector<std::string>;
using ActionCallback = std::add_pointer<void(Actions)>::type;
 
class MiniPlayer {
 
private:
    /* Audio files */
    FileVector files;
    FileVector::iterator currentPosition;
    /* Audio data */
    float volume;
    /* Action callback */
    ActionCallback callback;
 
protected:
    MiniPlayer() {
        files.reserve(10);
        currentPosition = files.begin();
        volume = 100.0;
        callback = nullptr;
    }
    ~MiniPlayer() { }
    /* Singleton dummy methods */
    MiniPlayer(MiniPlayer const&) = delete;
    MiniPlayer& operator=(MiniPlayer const&) = delete;
 
public:
    MiniMusic music; //<---------- Ошибка вылезает здесь
    static MiniPlayer& getInstance();
    FileVector& getFileList() { return files; }
    FileVector::iterator& getIterator() { return currentPosition; }
    int getCurrentIndex() { return currentPosition - files.begin(); }
    /* Music control methods */
    void setCallback(ActionCallback);
    void addAudio(FileVector files);
    void play(bool force);
    void play(bool force, int idx);
    void stop();
    void next();
    void prev();
    void vol(int);
    /* Music status methods */
    sf::Music::Status getStatus();
    /* Actions */
    void act(Actions a) const;
 
};

#pragma once
#include <SFML/Audio.hpp>
#include "MiniPlayer.h"
 
class MiniPlayer;
 
class MiniMusic : public sf::Music {
    
    MiniPlayer* p;
    bool onGetData(sf::SoundStream::Chunk& data) override {
        return sf::Music::onGetData(data);
    }
 
public:
    MiniMusic() {
        p = nullptr;
    }
    bool setCallback(MiniPlayer& p) {
        this->p = &p;
    }
 
};

class MiniPlayer;
 
class MiniMusic : public sf::Music {
 
    MiniPlayer* p;
    bool onGetData(sf::SoundStream::Chunk& data) override {
        bool res = sf::Music::onGetData(data);
        if (!res)
            p->next();
    }
 
public:
    MiniMusic() {
        p = nullptr;
    }
    bool setCallback(MiniPlayer& p) {
        this->p = &p;
    }
 
};
 
 
class MiniPlayer {
 
private:
    /* Audio files */
    FileVector files;
    FileVector::iterator currentPosition;
    /* Audio data */
    float volume;
    /* Action callback */
    ActionCallback callback;
 
protected:
    MiniPlayer() {
        files.reserve(10);
        currentPosition = files.begin();
        volume = 100.0;
        callback = nullptr;
    }
    ~MiniPlayer() { }
    /* Singleton dummy methods */
    MiniPlayer(MiniPlayer const&) = delete;
    MiniPlayer& operator=(MiniPlayer const&) = delete;
 
public:
    MiniMusic music;
    static MiniPlayer& getInstance();
    FileVector& getFileList() { return files; }
    FileVector::iterator& getIterator() { return currentPosition; }
    int getCurrentIndex() { return currentPosition - files.begin(); }
    /* Music control methods */
    void setCallback(ActionCallback);
    void addAudio(FileVector files);
    void play(bool force);
    void play(bool force, int idx);
    void stop();
    void next();
    void prev();
    void vol(int);
    /* Music status methods */
    sf::Music::Status getStatus();
    /* Actions */
    void act(Actions a) const;
 
};